Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d520d75ea4edbbe…

MALICIOUS

PDF

67.5 KB Created: 2020-12-06 11:25:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: a7def02919a205622e25f4cbadab2dbb SHA-1: 15dd76de0291beac2f2a3276ba05aa48487a71de SHA-256: 8d520d75ea4edbbedc1e93f9286355a28c13507d70bb4478a5a957ec112018e9
244 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable domains and redirectors, indicating a link farm or phishing lure. Heuristics confirm the presence of malicious redirector links and a link farm structure. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

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://ggtraff.ru/123?utm_term=sierra+vista+nancy+brua+animal+shelter In PDF document text
    • https://xipidutaz.weebly.com/uploads/1/3/4/4/134401361/xejawefe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459478/normal_5fa1fda069b7d.pdfIn PDF document text
    • https://buwolerujagelav.weebly.com/uploads/1/3/4/5/134580081/tekonuwusolapitijuse.pdfIn PDF document text
    • https://dokojivoko.weebly.com/uploads/1/3/4/3/134395563/figutor-fesojeremameru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383925/normal_5fad862a4256a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445869/normal_5fa4f9a62949e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469617/normal_5fa9580549685.pdfIn PDF document text
    • https://nirawulef.weebly.com/uploads/1/3/4/3/134324477/lesutedofin.pdfIn PDF document text
    • https://jifefovemerozix.weebly.com/uploads/1/3/4/4/134444698/wumak.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/tojabixefova/30539328567.pdfIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/mimovimetefasuw.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0c3d560f2895dc1e72903/t/5fc3d389e18c5c478e70b49e/1606669194339/army_skl_powerpoint_class.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0dfc5405d5340f3296f29/t/5fcbc24ea0b42e3566b02848/1607189074860/video_downloader_app_for_android_apkpure.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_off0000ca70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA70 5444 bytes
SHA-256: 5361a7cf41f63b0f73a6eb9acd5f5f85b5e60ae092f1b2e4ebff3e7df0988154
font_01_sfnt_off0000dcd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD2 10816 bytes
SHA-256: 7a2b016888bf603a7c270a4d3b23adec36d21b898a27e4c6f1fbdd346656e5fa

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