Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b5b4ef8bba7e457…

MALICIOUS

PDF

97.8 KB Created: 2020-12-31 17:58:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: a9c262033055272b3ccf416193668379 SHA-1: be381b2e2207764bcbcbb25742d0cf308e6dbd4c SHA-256: 8b5b4ef8bba7e45799dd7bad409c332a92fbd46956bd780b94607b7862a2464a
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains a large number of embedded links pointing to external PDF files hosted on disposable domains, a technique often used for SEO manipulation or to distribute further malicious content. The ClamAV detection and ML classifier strongly indicate maliciousness, with the embedded links likely serving as a lure or a distribution mechanism. While no scripts were explicitly extracted, the nature of the link farm and the presence of a redirector URL suggest potential for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://traffine.ru/strik?utm_term=spotlight+room+escape+level+3+puzzle In PDF document text
    • https://sodapovi.weebly.com/uploads/1/3/4/4/134494820/putalazaradazuwozus.pdfIn PDF document text
    • https://nabolonoroxene.weebly.com/uploads/1/3/4/3/134373159/cd73e50.pdfIn PDF document text
    • https://sepuvoguzunisam.weebly.com/uploads/1/3/4/4/134488558/5c9b388b904e.pdfIn PDF document text
    • https://xikalevu.weebly.com/uploads/1/3/4/3/134319979/vopejojowitezakew.pdfIn PDF document text
    • https://fapifejoj.weebly.com/uploads/1/3/4/2/134265577/3941052.pdfIn PDF document text
    • https://cdn.sqhk.co/baveninale/hAWEia4/34255639369.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367625/normal_5fdc8052039a0.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/a2700fda-14f8-4dc4-8b5b-d871abbd0a8b/nexabakelewavudetesibe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20c36a08-37d9-4d83-bc19-ab08694028d2/pamuvavege.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfd69c01-8c7d-42e7-9872-cf2650025140/68515366214.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2feb8e92-9d00-4fae-a43c-84c0b89e5543/geometry_unit_2_parallel_lines_and_transversals_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f43e9609-fd08-4868-ae3c-d3dcd6e6d653/jamunuxutaramexosukifozog.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_off000141da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141DA 5724 bytes
SHA-256: 99f5fce64892610eeebe1c2bb3b129cbb9b332c7563f404920c73a8cb8bdf2f3
font_01_sfnt_off00015537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15537 11088 bytes
SHA-256: 985635ff5340cf9ec1ed7892368bfd7e311b2fdcd4fdc34c6cef8fbad64cff91

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