Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad16c0d7ee6289b4…

MALICIOUS

PDF

78.8 KB Created: 2021-05-30 03:30:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 1dea157f95316682d2dee406b6e960dd SHA-1: 26746a09f1dd3448b78c86089be82057e6fc2168 SHA-256: ad16c0d7ee6289b4e12652cf1bf5447d19a836d2f3fab55248389aab4b10f8b3
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document employs a social engineering lure, instructing the user to install a browser extension or update to view content, which is a common tactic for credential theft or malware delivery. The document contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. While no scripts were directly extracted, the PDF structure and embedded URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://xezojetit.ru/strik?utm_term=auto+top+up+cash+card+app PDF link annotation
    • https://ganunosor.weebly.com/uploads/1/3/0/8/130814229/lideserowij.pdfIn PDF document text
    • https://vilavabakawo.weebly.com/uploads/1/3/1/6/131607043/mufadofoxejejak.pdfIn PDF document text
    • https://famojiwogupoj.weebly.com/uploads/1/3/2/3/132303340/6530539.pdfIn PDF document text
    • https://kesozawowoguza.weebly.com/uploads/1/3/5/3/135310598/01ddfc.pdfIn PDF document text
    • https://gekimirit.weebly.com/uploads/1/3/4/7/134700474/kudotovojuko.pdfIn PDF document text
    • https://tubonizuruzoxuk.weebly.com/uploads/1/3/0/9/130969435/rinavub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415292/normal_603ad45b0fe32.pdfIn PDF document text
    • https://putifetoz.weebly.com/uploads/1/3/7/5/137515519/f7fb15.pdfIn PDF document text
    • https://jilazokezabise.weebly.com/uploads/1/3/5/2/135296918/6174b1b69a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495402/normal_602fd2bd17bf3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387713/normal_6028e8661e0f3.pdfIn PDF document text
    • https://fuzujaloxoz.weebly.com/uploads/1/3/4/6/134684853/dba25.pdfIn PDF document text
    • https://sobanuwutotamiw.weebly.com/uploads/1/3/4/1/134131644/rijojaxajexuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495707/normal_603ae9391fb97.pdfIn PDF document text
    • https://fofoxugijajeb.weebly.com/uploads/1/3/4/7/134729320/170c8.pdfIn PDF document text
    • https://damijuvik.weebly.com/uploads/1/3/1/3/131381376/kugozotewurefebep.pdfIn PDF document text
    • https://wuguxobexo.weebly.com/uploads/1/3/0/7/130739488/6822829.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389365/normal_6011897b1c99a.pdfIn PDF document text
    • https://rituzanasalu.weebly.com/uploads/1/3/4/7/134718781/legodegavulofi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/84749595-fd9a-4298-a9f4-b7cb13f3596d/does_evening_primrose_work_to_induce_labor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4be019c-de38-4c22-aef4-1cf6f167510c/rolanilagoxabuwezedenujaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e06215c-eb77-42df-80e1-15fefdd8ab0c/text_oh_danny_boy_deutsch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf568172-7108-4b4a-9b54-fb1f8f4e08e3/town_hall_level_8_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92aef1dc-b857-4882-aa42-73715a3f3d2c/top_bookshelf_speakers_for_home_theater.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f126ada-e8aa-4eec-9a7c-4281ce40e659/how_to_write_an_essay_in_business_studies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dca88c8e-13b7-49f4-8248-384641bac7e6/bazokenewenubigixagomebi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/842cdbdc-5185-49d3-9761-267f1436e525/22967980212.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB39 4728 bytes
SHA-256: 5b05f7a5e6447a80710b9f6affd53e9530f3128da67be7036acf680344b7defb
font_01_sfnt_off0000fb51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB51 10592 bytes
SHA-256: 954980e9db228eb101cbe724a5dbc001a9d85fea3e21d73f4bfdd1067d979648
font_02_sfnt_off00011f8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8E 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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