Malicious PDF — malware analysis report

Static analysis result for SHA-256 19d5380c4faf6c0a…

MALICIOUS

PDF

76.8 KB Created: 2021-05-22 20:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 407e989a50c840a7728f373c165d0dc1 SHA-1: 88a4dc53d93e73e472eb9992232f7bbbf3e00927 SHA-256: 19d5380c4faf6c0ae29da251edc153bb9d9ac2d1b5a44b79ae159c36452e236a
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to distribute further malware or phishing content. The embedded URLs and the nature of the link farm suggest a phishing or malware distribution campaign.

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://midufefew.ru/strik?utm_term=etapas+del+desarrollo+psicosexual+de+sigmund+freud+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417216/normal_6047db8c40ac0.pdfIn PDF document text
    • https://sudarotabodubig.weebly.com/uploads/1/3/1/4/131407445/gonerepe-gujowusevamulud-lamugelepa-lizefizer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491157/normal_5fe15fbe5a5b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367268/normal_5fd2353eb67b3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425229/normal_6006105509d9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451555/normal_606c30a8bc765.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381321/normal_604bc260ed5f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490265/normal_606816912aa39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478123/normal_602899d3baf72.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446643/normal_5fca2c8eecd83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366028/normal_6064be6998aac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481069/normal_6009199dddcd1.pdfIn PDF document text
    • https://jemexegotida.weebly.com/uploads/1/3/4/4/134464186/risopuvifiguf.pdfIn PDF document text
    • https://fofalada.weebly.com/uploads/1/3/5/9/135968840/cfe03.pdfIn PDF document text
    • https://nitafigiwulizo.weebly.com/uploads/1/3/1/4/131406945/fegedanodi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445729/normal_604fab27b2adb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370078/normal_6046924cbce7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444377/normal_601c905ccc566.pdfIn PDF document text
    • https://valuluxunu.weebly.com/uploads/1/3/2/7/132710491/b29e0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455684/normal_5feebc050a553.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381101/normal_5fc7d5338bb5a.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/xuvamuba/muvew.pdfIn PDF document text
    • https://s3.amazonaws.com/dozuga/aadhar_without_otp_and_totp.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwawibu/bizhub_185_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/fovutotifofuduzivali.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_off0000ec6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6E 5500 bytes
SHA-256: 8831b404eb3d58c357fe655b57e68e87a4bfe934f30c051cf2404e7442571bf3
font_01_sfnt_off0000ff1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1C 11180 bytes
SHA-256: 882171e54775b809d2d4cbda6ce8b779e79885644eae7dbddf326d0069978ec9