Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cef0fb488386ded…

MALICIOUS

PDF

81.0 KB Created: 2021-03-04 18:59:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f82fdf20b755759b3611f0abd388b222 SHA-1: ba818db12e36ae20d1078efbe5166dc21db009fa SHA-256: 0cef0fb488386ded67a3483f9eeb5dc85b22ff3b0a6cc6b0fa4f5d5f22c4f362
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a significant number of external links, many pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://ponafet.ru/strik?utm_term=battery+tender+800+red+light+stays+on PDF link annotation
    • https://xevekefipozi.weebly.com/uploads/1/3/1/4/131406281/081af041d7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387709/normal_5ff0aa4bd195b.pdfIn PDF document text
    • https://jojiwunu.weebly.com/uploads/1/3/5/3/135387754/8716281.pdfIn PDF document text
    • https://lulodepi.weebly.com/uploads/1/3/0/7/130776712/nepaxamerubemi-bafebofiz-raporazasi-fusetiwafimaje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494440/normal_6028861a6245a.pdfIn PDF document text
    • https://xododasewa.weebly.com/uploads/1/3/4/6/134600374/6a4966d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464720/normal_603618ff5c5a3.pdfIn PDF document text
    • http://zesijesagevonot.22web.org/vidmate_apps_install_2014.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390684/normal_6023655b9ba05.pdfIn PDF document text
    • https://gamabisage.weebly.com/uploads/1/3/2/6/132681080/2448ba957b34.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/2eadff54-8521-4558-a851-dfb178f9a53e/white_fang_animated_movie_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f6d03df-5a6c-4840-bced-4c2d73a8e959/98390726677.pdfIn PDF document text
    • https://3a5aa097-47f9-475f-9992-83bceef25cc3.filesusr.com/ugd/f55bec_32751458820c43c081096a1e6fc2df89.pdf?index=trueIn PDF document text
    • https://41fe7446-7195-45c8-906d-de5e784989f9.filesusr.com/ugd/e02969_3510c6fe49204177a9a69dc5b3abc8ab.pdf?index=trueIn PDF document text
    • http://favekagopu.epizy.com/35492459100.pdfIn PDF document text
    • http://kunibenurupamiv.rf.gd/how_to_use_a_sodastream_crystal.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzotisenixava/fifolopib.pdfIn PDF document text
    • https://s3.amazonaws.com/potofaw/command_prompt_basic_commands.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85b11734-8716-4a6e-875e-8601dccb3d6e/wovamof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0748e3f8-c8b8-46d3-8a53-beb4c16ada0b/samsung_55_inch_smart_tv_6500_series.pdfIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/math_multiplication_worksheets_grade_8.pdfIn PDF document text
    • https://s3.amazonaws.com/difigomisosak/flash_video_from_website_opera.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/jolepojinabufukureru.pdfIn PDF document text
    • https://30383b9b-b26a-44f4-9a26-03873af8f03c.filesusr.com/ugd/fdee49_d5624f86394e459b8d7cfb22ee344e72.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/21b357ce-cd33-433a-924f-c3633721cd8a/tavifamikibometakez.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_off0000fae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE1 5576 bytes
SHA-256: aaeade51c7b5103c90493692dba534e8e65cf5c745d18d3f8d8c974ec2cbc833
font_01_sfnt_off00010dcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCB 11276 bytes
SHA-256: 4a7b7f8c63a5f63b9668fe78ad520acab30294e7c7071d158b9eb9add4897559

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