Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f3a61661c7c692e…

MALICIOUS

PDF

73.0 KB Created: 2020-12-28 08:51:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ebc5db3c0c828c73212a00027144e984 SHA-1: e1470a3f490f6e92a48268a0c741de2aed71c3f7 SHA-256: 7f3a61661c7c692e9a503b0995f80521fb848fc81f685c62a44eac12e87d0583
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to other PDFs, suggesting a link farm or SEO poisoning tactic. One of the primary URLs, 'https://trafftec.ru/strik?utm_term=iron+man+4k+hd+wallpapers+for+pc', is presented in a context that implies it leads to wallpaper downloads, but the heuristic 'PDF_SEO_LINK_FARM' and the ML classifier strongly indicate malicious intent. The presence of numerous benign-looking PDFs in the link farm is likely a tactic to obscure the malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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/strik?utm_term=iron+man+4k+hd+wallpapers+for+pc PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370054/normal_5f8edecb976d0.pdfIn PDF document text
    • https://cdn.sqhk.co/vogoxaginoje/gjMggek/interesting_facts_about_world_war_2_memorial.pdfIn PDF document text
    • https://cdn.sqhk.co/pitadewedobu/cnhgdRn/wynter_zombies_2_costume_party_city.pdfIn PDF document text
    • https://wodorolijuzawex.weebly.com/uploads/1/3/4/7/134770742/8c35b4232.pdfIn PDF document text
    • https://bonunobomatujo.weebly.com/uploads/1/3/4/3/134318799/3584198.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://s3.amazonaws.com/sakaburepagase/jazaregisuzorixag.pdfIn PDF document text
    • https://s3.amazonaws.com/xakusineba/free_able_templates_for_retirement_party_invitations.pdfIn PDF document text
    • https://s3.amazonaws.com/bejikefowu/rujivilo.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/my_sister_s_keeper_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44762004-42fd-4620-a30e-050a701ff1f8/76330080247.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/83673362897.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b0cdbb3-360e-4ddd-a76e-ca9b40cd9480/alienware_monitor_240hz.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/27108336588.pdfIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/vozezumujivix.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/jemebiluxomosor.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_off0000d3aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AA 5236 bytes
SHA-256: 4a1925d21431a1c975702e7f123092dba03bd52c8758ac75d5b2295c1afeaad0
font_01_sfnt_off0000e54d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54D 10396 bytes
SHA-256: 69699af68443ecc17b05d324ead773618c35a690138cf9b81a6676b0a42feb7d
font_02_sfnt_off000108ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EE 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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