Malicious PDF — malware analysis report

Static analysis result for SHA-256 bce35f5ed05f3903…

MALICIOUS

PDF

82.4 KB Created: 2020-11-11 00:00:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b701051f20fbe1b8e71bac896748b379 SHA-1: d7f93c6f8ff548664716ef7a03a8eed5d40d3cf6 SHA-256: bce35f5ed05f3903dd6f195b87a98ff9c6f5a67620f52a0a5b2ba621c37f95a2
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffnew.ru/strik?keyword=biological+science+7th+edition+freeman+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369911/normal_5f9f28c88bdc0.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/ramugimexixepaba.pdfIn PDF document text
    • https://tugarekuxu.weebly.com/uploads/1/3/4/3/134307697/pajugapemovolodawex.pdfIn PDF document text
    • https://fewevivib.weebly.com/uploads/1/3/0/8/130813821/vititobiwisib.pdfIn PDF document text
    • https://mabanopovofed.weebly.com/uploads/1/3/1/4/131453130/a3202e3bb0eb.pdfIn PDF document text
    • https://vupimolafi.weebly.com/uploads/1/3/1/3/131398504/sogatava.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/aa50b73f-1ef3-4ca1-802f-7e2c1d91ee49/23909434453.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a2889bc-c6b1-4edb-a7ca-445e0963a716/tesla_stock_price_history.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/42755654537.pdfIn PDF document text
    • https://s3.amazonaws.com/petikamov/mega_man_unblocked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba9d6bb5-4056-4a54-96a0-4ac7891c49bb/42901565208.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7227c4d2-a043-4894-8e48-273de49b0a28/popozapomav.pdfIn PDF document text
    • https://s3.amazonaws.com/gatiwaraluva/16_month_calendar_2020_2021.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/zuwowifilikanalori.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_off000102bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BB 5700 bytes
SHA-256: 3d2e05cf7baf1dc9968b4020b3b14adcbbecbeac7fac7824698b17739b91362d
font_01_sfnt_off000115fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115FD 11252 bytes
SHA-256: c5fd3081adf08273ef1e5e61f0e814ac81677826774f2a1463bca52f956bd73b

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