Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd94a225b7aac784…

MALICIOUS

PDF

82.1 KB Created: 2021-04-07 00:56:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c79446cc27286b72d51207883d410d9e SHA-1: 2f00a4564b6d6948343fb116018669c90c02d408 SHA-256: bd94a225b7aac7846527ea572bb67135be70121764075aaa4311ea37fdcc73bf
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to distribute further malware or phishing content. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://mezovuduw.ru/123?utm_term=oxidation+reaction+mechanism+pdf PDF link annotation
    • http://sugameloxufe.mywebcommunity.org/what_is_the_dominant_theme_of_the_yellow_wallpaper.pdfIn PDF document text
    • https://juzemadarerux.weebly.com/uploads/1/3/1/4/131437885/3470323.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413016/normal_5fd25fb86de3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489853/normal_6025099e83d98.pdfIn PDF document text
    • https://nifogagerosore.weebly.com/uploads/1/3/5/3/135300162/wasafesijev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461250/normal_60296b3e6f806.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467287/normal_60017b4920e71.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411694/normal_5fe01611aabf9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403415/normal_60695f7cdee39.pdfIn PDF document text
    • http://pozuvixa.getenjoyment.net/batho_pele_principles_in_health.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383921/normal_604aa6074d5ee.pdfIn PDF document text
    • https://kasikijafeke.weebly.com/uploads/1/3/1/4/131406722/pinatigetube.pdfIn PDF document text
    • http://nefozufovi.scienceontheweb.net/71780341844.pdfIn PDF document text
    • https://vufofameti.weebly.com/uploads/1/3/0/8/130874118/rakuwanasunower.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465264/normal_60349394486a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462992/normal_5fe86331958a0.pdfIn PDF document text
    • https://pazumiwasosum.weebly.com/uploads/1/3/4/8/134892739/xaturo-meruvama.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/235e1d33-435e-4fa7-8751-3452c356a035/62809935719.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6ead501-9eb5-4e5b-a64a-1b3013d13f65/danopezafu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0784f4bd-b2fc-4fcc-b1a1-fcecda4b5e85/50cc_mini_dirt_bike_for_sale_cheap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84fc6bce-3e08-4a28-9f56-7c4a6762522b/78135816017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b469f11-757d-4fbd-bb7c-9b02fde018d0/sat_prep_black_book.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001019a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019A 5460 bytes
SHA-256: 188080ecece19dd90a51d38bfe0cb4a189fe89190916a763eae6c431f90198d4
font_01_sfnt_off00011406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11406 11472 bytes
SHA-256: 46547ced5cd8d445dbc3bf16dcd081b6d00cda22417c7493a75622caf69918e0