Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0fcaeccc4141899…

MALICIOUS

PDF

65.0 KB Created: 2021-01-06 07:12:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 53f4c9d997070147f557cc9ac18fb7e6 SHA-1: ce7ffb2256843ddaddf9760ce256eec3017b8de5 SHA-256: c0fcaeccc4141899f28499ee54ef90d07849f7d4fa568cd6592eb7ef74a0c049
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document exhibits characteristics of a link farm, with numerous external URLs pointing to other PDF files, many hosted on disposable domains. This is strongly indicative of SEO manipulation or a distribution mechanism for malicious content. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

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://trafftec.ru/123?utm_term=apostrophe+worksheets+for+grade+4+with+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4419836/normal_5fecef630ee02.pdfIn PDF document text
    • https://denonifo.weebly.com/uploads/1/3/4/7/134709080/d7a60b09d28df2.pdfIn PDF document text
    • https://dizuzoboxok.weebly.com/uploads/1/3/4/3/134351397/d487266510b2d84.pdfIn PDF document text
    • https://rojusonevupa.weebly.com/uploads/1/3/0/8/130814232/7861295ca2352.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369499/normal_5f9fd0c50aec3.pdfIn PDF document text
    • https://temoxemotedi.weebly.com/uploads/1/3/4/5/134599163/tejetimoko-dawizidozof-todelawagi-rulalezexa.pdfIn PDF document text
    • https://sivisobimiji.weebly.com/uploads/1/3/4/7/134754783/6ccc133b2c9f31a.pdfIn PDF document text
    • https://jonukejunuxesa.weebly.com/uploads/1/3/1/4/131409236/todidudivonedi-bimuzojoxuke-kibamabutal-dakaned.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/dd292b5a-95fe-42f1-b9a6-c10afab2a9df/physics_force_of_friction_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/941645db-4c2f-4f23-a28f-e009d41d778f/1932352171.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28760d8d-6b35-465e-9f4f-c7ec8f2a9871/steins_gate_okabe_english_voice_actor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96c21f5b-3c7a-4c5e-ad76-c29f30da0517/mendelian_genetics_worksheet_answers.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_off0000c0da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0DA 5504 bytes
SHA-256: bfc3c84d2f054a5fcc470551393e3eb9fe98fa64e2a1e9701b7540f2c41de1a1
font_01_sfnt_off0000d3a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A9 10272 bytes
SHA-256: 8cc2247e72d042afd151c565dcec880dc9c8fbbcddf84d46dddbd3dc0465894d

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