Malicious PDF — malware analysis report

Static analysis result for SHA-256 68fa7eb976c96dab…

MALICIOUS

PDF

78.9 KB Created: 2021-05-20 21:40:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 4add69157cf8b51c162fc0bb45201acb SHA-1: 4ababeadc1d819df612a61e20ad708a76a3d318e SHA-256: 68fa7eb976c96dabea644e0c492c452cc7ad021484c1ba5d14d1826bed449f68
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack by embedding numerous URLs.

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://fokemale.ru/strik?utm_term=evaluation+cm1+adjectif+qualificatif+pdf PDF link annotation
    • https://puzejiwitamino.weebly.com/uploads/1/3/1/4/131453698/8774997.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413583/normal_5fe2a9b172b07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453532/normal_5fd7106b1ef37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450354/normal_606a20c194c00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366319/normal_60426e1f9e2a2.pdfIn PDF document text
    • https://tuzuratodaf.weebly.com/uploads/1/3/0/7/130738639/f63cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444877/normal_606ad945a0007.pdfIn PDF document text
    • https://bojuwakuxejekur.weebly.com/uploads/1/3/5/3/135347713/6ae127ec5.pdfIn PDF document text
    • https://zukodefikarux.weebly.com/uploads/1/3/4/4/134498552/4df1be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403534/normal_60357c7eb28bd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367302/normal_5ffccfc6b47b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411916/normal_60582fc6009a8.pdfIn PDF document text
    • https://vunisanelebori.weebly.com/uploads/1/3/3/9/133999195/ziwasekirotetop-fomufipiv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/travel_expense_spreadsheet_template.pdfIn PDF document text
    • https://s3.amazonaws.com/divelikubapiwaj/22705093961.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c0473ca-f613-47a0-b1a6-eaa046f3b81a/kesavavusimamusitudoz.pdfIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/excalibur_echo_remote_start_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/how_to_reset_a_schlage_keypad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb05f866-29e4-497f-b477-9453c4822449/12690254031.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa247bc9-af6b-4675-bbcd-70a343cb8128/20813404084.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_off0000f269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF269 5296 bytes
SHA-256: 9470c266a9961427cefa08a50d25e24ba90913b934e0dff9256e8e6eec00f0e9
font_01_sfnt_off0001047b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047B 12604 bytes
SHA-256: 5d389cfb389515f5b0a4afd142e1c413b26be251185cfac50e387d3ab4f0612c

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