Malicious PDF — malware analysis report

Static analysis result for SHA-256 52675e35322544ce…

MALICIOUS

PDF

77.6 KB Created: 2021-06-08 14:24:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fbb275a38e82a31240840c9caf66854b SHA-1: a43e65ec3b0794704433862f915cb05cf3d6fd17 SHA-256: 52675e35322544ce4c106c0c0e72599981c38476bb38dab63e066fe67de0d724
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for link farms and phishing campaigns. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of generated links, suggesting an attempt to manipulate search engine results or distribute malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://catamma.ru/pbw?utm_term=2001+polaris+sportsman+500+ho+awd+wiring+diagram
    • https://jogapemufa.weebly.com/uploads/1/3/4/4/134492880/7457144.pdf
    • https://static.s123-cdn-static.com/uploads/4464523/normal_5ffb9439329cf.pdf
    • https://static.s123-cdn-static.com/uploads/4368745/normal_5fcb64a9e7af1.pdf
    • https://cdn-cms.f-static.net/uploads/4502817/normal_602125ee2c663.pdf
    • https://cdn-cms.f-static.net/uploads/4416494/normal_5fd1449100654.pdf
    • https://cdn-cms.f-static.net/uploads/4383445/normal_60b91adb348ab.pdf
    • https://cdn-cms.f-static.net/uploads/4416787/normal_5fdb4102583f0.pdf
    • https://zobuxojakaxux.weebly.com/uploads/1/3/4/6/134690110/fawurubiw_jafefe_xezet.pdf
    • https://static.s123-cdn-static.com/uploads/4445130/normal_5ff40ba656d76.pdf
    • https://static.s123-cdn-static.com/uploads/4427821/normal_5fe418e7ba916.pdf
    • https://static.s123-cdn-static.com/uploads/4486034/normal_5fee209daae81.pdf
    • https://cdn-cms.f-static.net/uploads/4389108/normal_6063a268e2d27.pdf
    • https://static.s123-cdn-static.com/uploads/4391920/normal_5fcd5992ad3e5.pdf
    • https://lujajumivovun.weebly.com/uploads/1/3/0/7/130776132/5826a.pdf
    • https://cdn-cms.f-static.net/uploads/4422368/normal_6046e2a79e218.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://dowiginade.pbworks.com/w/file/fetch/144814293/manual_de_entrenamiento_fsico_militar.pdf
    • https://uploads.strikinglycdn.com/files/576026ee-4f05-4b79-af6c-06cf8fbd007b/87920127115.pdf
    • https://uploads.strikinglycdn.com/files/4dff6e11-407b-4f36-b84d-e13568f729b8/nokefubajagaserikesi.pdf
    • http://vatojorisa.pbworks.com/w/file/fetch/144581577/12th_fail_manoj_sharma_book_free_download.pdf
    • http://gibuwodebu.pbworks.com/w/file/fetch/144527742/how_to_troubleshoot_electrical_outlet.pdf
    • https://uploads.strikinglycdn.com/files/bf1c0126-e353-44a3-85e1-ee6d03fb2bfe/how_to_write_copy.pdf
    • https://uploads.strikinglycdn.com/files/1876a0a8-18ce-42c9-94f1-9f9d178f8ee3/35623569611.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e445.bin
7a1dd5bb12fc9cfce9758d135feb7ba5d81258b6f8fe10d99a7c4ae7d18653e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE445 5492 bytes
font_01_sfnt_off0000f6be.bin
8d5f56ae47980ec398e46e9c6704fc25aa0babadd51cff2ad7cc5c2f7d0d0e71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BE 10480 bytes
font_02_sfnt_off00011a83.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A83 4324 bytes

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