Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f9a7330aaac594a…

MALICIOUS

PDF

66.5 KB Created: 2021-01-15 13:36:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 5119dd5f0ededce8411c3b67261fbb0e SHA-1: 20b806aad8892fa7bbe9fbd4876f890e0e9a656a SHA-256: 6f9a7330aaac594a8d2f39e13a43ddf1fbd1dd6dd66c67037da913cb924d9b75
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains references to 'antivirus para android mejor', likely a lure to entice clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/aws?utm_term=antivirus+para+android+mejor PDF link annotation
    • https://cdn.sqhk.co/pivokazi/pkv84ii/77102931436.pdfIn PDF document text
    • https://wibejimexog.weebly.com/uploads/1/3/4/4/134466339/kizujus.pdfIn PDF document text
    • https://xiduxerajul.weebly.com/uploads/1/3/4/6/134696605/tulis_suzenawazulab_dimujewexewom.pdfIn PDF document text
    • https://wiwanozamo.weebly.com/uploads/1/3/4/3/134306351/pigazelurakizux_kewotoxuxaze_rujebisafuwabit.pdfIn PDF document text
    • https://ribovaboj.weebly.com/uploads/1/3/0/7/130775049/lavoforapafebupo.pdfIn PDF document text
    • https://cdn.sqhk.co/kibedutej/JhMiaii/66921968855.pdfIn PDF document text
    • https://duzopotubesafes.weebly.com/uploads/1/3/4/8/134890215/5145336.pdfIn PDF document text
    • https://cdn.sqhk.co/wodigajamu/cZgcbjd/masterminds_book_4.pdfIn PDF document text
    • https://savakorudefipe.weebly.com/uploads/1/3/2/3/132303238/puseg-sikagewupepowik-losomer-gerabikemipavi.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/lebaxa/tipifel.pdfIn PDF document text
    • https://s3.amazonaws.com/towakog/biostatistics_and_epidemiology_sylvia.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_off0000cc18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC18 5200 bytes
SHA-256: 82fec34eef243a2e9b6eb60b968561cca4c906d3b64bbd6c0838b22fc3b851ed
font_01_sfnt_off0000ddba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBA 9304 bytes
SHA-256: b4eb8a86f47db56a6626c547ea058e92f1c850b56e3af549be6e1199ec3adf5d

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