Malicious PDF — malware analysis report

Static analysis result for SHA-256 80af20a2ff215d0e…

MALICIOUS

PDF

79.4 KB Created: 2021-01-06 09:43:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: b703fb8b0b92f30e786909a9dc2d652c SHA-1: 98c3326970ee287e76608f35c8945ee2ec774c4c SHA-256: 80af20a2ff215d0eb675bb131a2c38e4928db7eb01044dd9e9cfcefdaabfd1f0
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafftec.ru/aws?utm_term=swords+and+sandals+2+ranged+guide PDF link annotation
    • https://pekumovulimezel.weebly.com/uploads/1/3/4/3/134363026/vuxokofem.pdfIn PDF document text
    • https://cdn.sqhk.co/sikibeve/8iihajf/93281600583.pdfIn PDF document text
    • https://verijijul.weebly.com/uploads/1/3/4/8/134861220/lasefemigoweped.pdfIn PDF document text
    • https://cdn.sqhk.co/faruzikako/rXJRkgd/small_house_entrance_lobby_design_ideas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457318/normal_5fe440f20f7da.pdfIn PDF document text
    • https://fapusogemewesil.weebly.com/uploads/1/3/2/3/132302858/7403619.pdfIn PDF document text
    • https://kizekusoviwo.weebly.com/uploads/1/3/1/4/131453028/7290192.pdfIn PDF document text
    • https://cdn.sqhk.co/mokavokaven/RKmlNSy/84776750716.pdfIn PDF document text
    • https://leruzifu.weebly.com/uploads/1/3/2/3/132302941/8820188.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/e3f6d489-2e00-45cc-af32-08e1f9b7ab85/dijelometivudif.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE649 5124 bytes
SHA-256: 3f8fef16bd1b7701eeab51d19e490fca3ce749406784af321ab8983bfaa14da1
font_01_sfnt_off0000f7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BF 14944 bytes
SHA-256: 07ca47496de8c259bb9b05ca48a7b82687c8c2b09ddb17aabcfaae6e49d6375f
font_02_sfnt_off00012253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12253 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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