Malicious PDF — malware analysis report

Static analysis result for SHA-256 66e64f76e788f60e…

MALICIOUS

PDF

80.8 KB Created: 2021-05-20 20:58:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 4c9d3bc468324d34f5e24df0169b36e2 SHA-1: 7c48d5dc1dec7da3dcc5e33c023eeddabf98526d SHA-256: 66e64f76e788f60e82126f086d538771b3f70eaea019f5d0204d9c49ec82f761
126 Risk Score

Malware Insights

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

This PDF document is classified as malicious by ML and ClamAV, and contains multiple heuristics indicating it is a link farm on disposable hosting. The document body, though heavily corrupted, suggests it is disguised as interview preparation material. The embedded URLs, such as 'https://botokaw.ru/strik?utm_term=questions+and+answers+for+executive+secretary+interview', are likely used to redirect the user to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://botokaw.ru/strik?utm_term=questions+and+answers+for+executive+secretary+interview PDF link annotation
    • https://tenabawik.weebly.com/uploads/1/3/2/7/132710661/jajazudina_lojini_kogur_wapet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472494/normal_60312926ec490.pdfIn PDF document text
    • https://dojufewuwi.weebly.com/uploads/1/3/4/2/134235401/7089596.pdfIn PDF document text
    • https://jimigafekalese.weebly.com/uploads/1/3/1/4/131407537/b991895c24a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471109/normal_5ffdf1bc90d64.pdfIn PDF document text
    • https://vejanozamafiz.weebly.com/uploads/1/3/5/3/135351199/8172833.pdfIn PDF document text
    • https://tizonitiwu.weebly.com/uploads/1/3/4/7/134734793/joresetimadip-lujemubo-silefujape-jixasekopu.pdfIn PDF document text
    • https://mivebomuponi.weebly.com/uploads/1/3/1/3/131398008/pudumosezu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483338/normal_6031f87b0eb0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373504/normal_600a955944daa.pdfIn PDF document text
    • https://kekoluborefox.weebly.com/uploads/1/3/5/3/135327445/2938159.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373999/normal_5fd5fe5a7035d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489583/normal_600e44c6ea927.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464534/normal_60672cbec8b66.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/6d69c7ee-9ac2-4086-bae6-27df5747d439/why_my_tv_screen_is_black.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db2546fb-0b57-4a25-9e54-2d2678807888/how_the_grinch_stole_christmas_poem_short_version.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_off0000feec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEC 5368 bytes
SHA-256: 89bdd7d8310257f9a9b74dbb9c218c0881b827ab129717bc11d833c1152f6a9a
font_01_sfnt_off00011160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11160 10808 bytes
SHA-256: b66d557fa7c5c1d89fa75531f5531cd764139cf94786b33097acd6631e101912

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