Malicious PDF — malware analysis report

Static analysis result for SHA-256 b822fc1c2a5ea7fe…

MALICIOUS

PDF

101.6 KB Created: 2020-11-25 20:54:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9dc9657a65873d5a1d8ac280a6981e46 SHA-1: 1d42ce3030f2c2783c8bc255e92ce2f0ca899078 SHA-256: b822fc1c2a5ea7feecf30922e92423d1743acef964e18c165ed1f96d30d50f7a
184 Risk Score

Malware Insights

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

This PDF document contains a mass of external links, many pointing to disposable hosting, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of techniques used to redirect users to malicious sites, potentially exploiting vulnerabilities or delivering further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9467

Heuristics 5

  • 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.
  • 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 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
  • 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://trafficel.ru/aws?utm_term=disable+user+agent+stylesheet+safari
    • https://fumubesoxumus.weebly.com/uploads/1/3/4/4/134485348/joxazanekosebu.pdf
    • https://saloramorolo.weebly.com/uploads/1/3/4/3/134307331/d618513cef031f8.pdf
    • https://niwejeru.weebly.com/uploads/1/3/4/3/134308800/siwejutifub.pdf
    • https://xogupugisi.weebly.com/uploads/1/3/4/1/134109029/493004.pdf
    • https://cdn-cms.f-static.net/uploads/4375087/normal_5fb7f36661b62.pdf
    • https://godadonalizubo.weebly.com/uploads/1/3/1/4/131437317/jodomiwikebasos.pdf
    • https://wajiresejepo.weebly.com/uploads/1/3/0/7/130774962/nisomiwepizizu.pdf
    • https://rikurifijuse.weebly.com/uploads/1/3/4/6/134681474/rezovovob.pdf
    • https://zopavuro.weebly.com/uploads/1/3/4/5/134584556/datijaxesututipuno.pdf
    • https://s3.amazonaws.com/wapabefizosumi/68785411845.pdf
    • https://uploads.strikinglycdn.com/files/d5233169-e9bc-4282-8bbe-9f8e9eee1447/rosetogixube.pdf
    • https://uploads.strikinglycdn.com/files/16da4618-53bf-418b-af81-62a4006eaaa4/4730396194.pdf
    • https://uploads.strikinglycdn.com/files/5b2425a8-406b-4f68-b6d3-5410e98f00d5/concise_introduction_to_tonal_harmony_total_access.pdf

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