Malicious PDF — malware analysis report

Static analysis result for SHA-256 9372356b14616c9f…

MALICIOUS

PDF

66.2 KB Created: 2020-12-20 23:13:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 88f21a0b713db6d7c40cc57ce345746d SHA-1: 5589ecea6f4cb9712cb20fc31fe8ea4441270670 SHA-256: 9372356b14616c9fce69690a169cb674585831de176d4f8b7c5d262da4eca73f
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and a machine learning classifier. It contains a large number of embedded links, with at least one identified as a malicious redirector and many others pointing to disposable hosting, suggesting a link farm for phishing or malware distribution. The document body is heavily obfuscated and unreadable, but the presence of numerous external links is the primary indicator of malicious intent.

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://traffking.ru/123?utm_term=john+lee+smooth+manifolds+pdf In PDF document text
    • https://romovemesokawaj.weebly.com/uploads/1/3/4/4/134479736/fatafenunufatoparik.pdfIn PDF document text
    • https://poraduke.weebly.com/uploads/1/3/4/3/134385775/5e368fb479161c.pdfIn PDF document text
    • https://revugegan.weebly.com/uploads/1/3/4/6/134682990/863428.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368235/normal_5fb6cbd607518.pdfIn PDF document text
    • https://nikuwexipamojag.weebly.com/uploads/1/3/0/8/130813731/xavajadakiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394061/normal_5f98c5c511070.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367950/normal_5f8a16fc3e935.pdfIn PDF document text
    • https://goduvozimaku.weebly.com/uploads/1/3/1/3/131380582/popiziwot.pdfIn PDF document text
    • https://maxifabosogup.weebly.com/uploads/1/3/4/5/134526580/darak.pdfIn PDF document text
    • https://rapovadok.weebly.com/uploads/1/3/4/7/134705404/jetomo.pdfIn PDF document text
    • https://xelixaxoso.weebly.com/uploads/1/3/1/4/131407481/b378460.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc57e843398ff75154ce56f/t/5fcb92449cf56e0e8b13f24f/1607176772975/flappy_bird_blink_di_instagram.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdc79c85e71df64d6bd9c29/t/5fdcae37f71e1d2dc1bab130/1608298042794/pathologie_de_l_appareil_gnital_masculin.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_off0000c6b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B4 5176 bytes
SHA-256: be13c4bb8d1d91dc41047de0248074e2a6d5d93d55beebf0e2a0947ca93bc027
font_01_sfnt_off0000d829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD829 10708 bytes
SHA-256: a1afda08369d8a1a69b5bca005ba8562ad15792ebc609a06cc5ff8a92c43f4b6

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