Malicious PDF — malware analysis report

Static analysis result for SHA-256 fad3a1f656e32f0f…

MALICIOUS

PDF

75.9 KB Created: 2021-02-22 02:15:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: b0b1d2fa27945ecb54f8ee8cbc32677e SHA-1: 53f1c40b57a9fce4fe1b4f5de3e04c1f2c02f282 SHA-256: fad3a1f656e32f0f831adea614a093609be0df1655ca44b7641e191f294480c3
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, including critical alerts for linking to known malicious redirectors and hosting a large link farm. The document body, though heavily obfuscated, contains text related to search engine optimization and traffic generation, suggesting a phishing or SEO spam campaign. The numerous embedded URLs point to disposable hosting and potentially malicious content.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=what+does+a+flashing+yellow+light+mean In PDF document text
    • https://dugaxopi.weebly.com/uploads/1/3/5/3/135305828/tovipu.pdfIn PDF document text
    • http://fastcreditcheck.info/fani_cyclone_imagesdamr0.pdfIn PDF document text
    • https://sulogifobib.weebly.com/uploads/1/3/5/3/135322722/3b8f20ea.pdfIn PDF document text
    • https://daregunomunozo.weebly.com/uploads/1/3/4/7/134723938/4675651.pdfIn PDF document text
    • https://doselarifiniwa.weebly.com/uploads/1/3/2/8/132814949/6b7a314484.pdfIn PDF document text
    • https://raromimuzu.weebly.com/uploads/1/3/0/8/130874361/3525922.pdfIn PDF document text
    • https://vizifota.weebly.com/uploads/1/3/0/9/130969876/jexugifod-jigadubiz.pdfIn PDF document text
    • https://pedasivu.weebly.com/uploads/1/3/5/3/135387907/jajumebaveworo-binuviza-xotopevajaruf.pdfIn PDF document text
    • https://mafetoga.weebly.com/uploads/1/3/0/8/130874134/fufabejitekuxos.pdfIn PDF document text
    • https://bopevifobomamak.weebly.com/uploads/1/3/0/8/130814579/07783a883.pdfIn PDF document text
    • https://lemapemoj.weebly.com/uploads/1/3/4/0/134040436/8906688.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/gateme/more_songs_for_beat_saber_ps4.pdfIn PDF document text
    • http://zaxutakizet.epizy.com/38543010155.pdfIn PDF document text
    • https://s3.amazonaws.com/remavuj/gokagituforinijirevo.pdfIn PDF document text
    • https://s3.amazonaws.com/fizufapu/pulonifu.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_off0000ec4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4C 5432 bytes
SHA-256: cb7ab95647a98033f301e276fece26bf893fbff18fc74a18657ff11dc426d77c
font_01_sfnt_off0000fec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC4 10396 bytes
SHA-256: eed81ed54e50a3daa689c902405cc8566cc619aac8865104b4479c9b2de124fa

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