Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe1ba9473bcb32f9…

MALICIOUS

PDF

72.9 KB Created: 2021-01-08 14:43:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 0a1febf647c350aa9c53b6ca1d712409 SHA-1: 7a4abb7e466064ce7d3982aceab178f81a05ceff SHA-256: fe1ba9473bcb32f9bccf49cfe927c7883ba7d138cba39abec45d219ba8b3a9c2
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous external URIs pointing to various domains, including 'trafffe.ru' and multiple 'weebly.com' subdomains. The primary purpose appears to be directing users to external content, potentially for SEO manipulation or to host further malicious payloads.

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://trafffe.ru/123?utm_term=most+common+bacteria+in+cosmetics PDF link annotation
    • https://nedotumawu.weebly.com/uploads/1/3/4/6/134626041/jawosusu.pdfIn PDF document text
    • https://cdn.sqhk.co/zezoxomop/icibLKn/84420025989.pdfIn PDF document text
    • https://jepifobowokeba.weebly.com/uploads/1/3/0/7/130776363/8ca5b75ae7d.pdfIn PDF document text
    • https://vasikeja.weebly.com/uploads/1/3/2/7/132710563/401d3b09f5409be.pdfIn PDF document text
    • https://finiluxexolije.weebly.com/uploads/1/3/1/8/131856594/nebomenoloxatum.pdfIn PDF document text
    • https://guxesawaxogego.weebly.com/uploads/1/3/4/3/134314991/goburekugexafor-vixozelitawesi.pdfIn PDF document text
    • https://rezikixudagip.weebly.com/uploads/1/3/4/7/134746502/pikixutax_risewo_pukavob_xemetekowote.pdfIn PDF document text
    • https://viwuwobigoku.weebly.com/uploads/1/3/1/3/131378942/riwiw.pdfIn PDF document text
    • https://cdn.sqhk.co/mudinaxape/Sjjqpp4/movies_coming_out_in_october_2020_uk.pdfIn PDF document text
    • https://filavemegu.weebly.com/uploads/1/3/4/8/134883773/bivorogajuzerusuped.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/93bdcc7d-09b0-49ae-adcb-4da013481fbd/romobagizururobetimurefo.pdfIn PDF document text
    • https://s3.amazonaws.com/tikofaketonub/laluguk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0387d25b-dbd6-456c-8780-52eb0a495802/math_pickup_lines.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_off0000e187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE187 5060 bytes
SHA-256: fd989e09752d84ebcc81a972615f920e3c43255257a0e73590ff353ea93f44f7
font_01_sfnt_off0000f2ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AD 10664 bytes
SHA-256: 1c9e95498b2d0f92baf534255aab2ad5905e19633bfbdd4d4f73c13f183399a5

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