Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f12b5b09dcdceb7…

MALICIOUS

PDF

60.3 KB Created: 2020-11-18 21:30:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: ff99f72c6b23ecc55b43fee23d3ac75b SHA-1: ba085e24aa42b2e3fef8b950b27bf1bfb45d35b6 SHA-256: 3f12b5b09dcdceb75977d11d3ab736ad4a9e1eb6eb5cf22be6fda1893307de2b
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure and a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links point towards a phishing or malicious redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://gettraff.ru/strik?utm_term=ejercicios+circuitos+mixtos+3+eso+pd In PDF document text
    • https://xasigevas.weebly.com/uploads/1/3/4/5/134595911/6170522.pdfIn PDF document text
    • https://pumowurunumig.weebly.com/uploads/1/3/2/7/132740285/zamupudebomimaze.pdfIn PDF document text
    • https://titenukom.weebly.com/uploads/1/3/4/5/134523185/folukakadenarekileti.pdfIn PDF document text
    • https://saxibodusazo.weebly.com/uploads/1/3/0/7/130740440/4141888.pdfIn PDF document text
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/lasitoxajazug.pdfIn PDF document text
    • https://kasukironumasex.weebly.com/uploads/1/3/1/4/131454791/ce2c21c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387807/normal_5fa8cddfb2074.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/tizowodifi/leather_glasses_case_pattern.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/394812d3-4ac0-4444-99b4-5d9c78040bde/45418101996.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3f58eff-660f-44e3-b7c4-fb3073bc83d5/28960836463.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/in_text_mla_citation_for_encyclopedia.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_off0000af3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF3C 5240 bytes
SHA-256: 642237269c1dfe9e66a84d47fb6cdb0c3fcca5892342b944cd3312dbddf1e677
font_01_sfnt_off0000c104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC104 10916 bytes
SHA-256: c7839e2357fe779eac93653675bf1d791d2da3324990cc9240bd7d1f0ae37d61

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