Malicious PDF — malware analysis report

Static analysis result for SHA-256 b81f6d40827bab9f…

MALICIOUS

PDF

112.9 KB Created: 2021-04-15 00:54:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a7f38e7492bffc9c5defc5763ae49988 SHA-1: 55c64ad4a29dbac20a3a6bc291e2d75fe75a6475 SHA-256: b81f6d40827bab9f79696da2e9e315f69da79648bd12a6de3cf6961d37b43f5f
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://mezovuduw.ru/strik?utm_term=mothers+day+inspirational+quotes+to+a+friend PDF link annotation
    • http://wdd13.ru/58711323265ws922.pdfIn PDF document text
    • http://carinsusa.com/pokagavosdctaq.pdfIn PDF document text
    • http://oneitshop.pro/laptop_acer_aspire_v5_touch_screenoyk9u.pdfIn PDF document text
    • https://minaraxu.weebly.com/uploads/1/3/4/7/134765114/lakelazolumebaf.pdfIn PDF document text
    • https://senajadodum.weebly.com/uploads/1/3/1/3/131379015/e5c332247ea0a.pdfIn PDF document text
    • https://jimilosebot.weebly.com/uploads/1/3/4/0/134096588/tabarofaza.pdfIn PDF document text
    • https://kegozorud.weebly.com/uploads/1/3/0/7/130740561/f533cf6.pdfIn PDF document text
    • https://cdn.sqhk.co/lajawawinu/jiiHggj/79198248683.pdfIn PDF document text
    • https://cdn.sqhk.co/vadezewe/isjjcja/sakura_school_simulator_mod_apk_ios.pdfIn PDF document text
    • https://zekufizow.weebly.com/uploads/1/3/0/7/130775694/1561261.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://af30af13-e0b7-4de0-aca7-7783c01eade2.filesusr.com/ugd/9757e7_21fae92514cb4ce7a1c2ebd9e8a72dfe.pdf?index=trueIn PDF document text
    • http://kigetivizaru.epizy.com/kriteria_sepsis_adalah.pdfIn PDF document text
    • https://e39bfc17-a898-4016-ac91-fc9303c112df.filesusr.com/ugd/b5068a_e07b60aac4174133ba017a52ccde3c7a.pdf?index=trueIn PDF document text
    • http://semomudunetowa.rf.gd/abdominal_surgical_incisions.pdfIn PDF document text
    • https://f87ce62f-3d5d-4c42-bff3-2e7d00444551.filesusr.com/ugd/72ed28_6af9dc9f11b34be5b27c775fe396c2c4.pdf?index=trueIn PDF document text
    • https://c5c27394-2042-4749-9b39-d1c24dcbd9f0.filesusr.com/ugd/e9b987_c59844c1f520451396392695683fed29.pdf?index=trueIn PDF document text
    • https://8641c524-1fb5-4292-87ed-dd72f64d6c22.filesusr.com/ugd/9b7d8a_1d85332f13af45339807b166066713af.pdf?index=trueIn 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_off00016be2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BE2 5244 bytes
SHA-256: 22027749741bc97119e89f29b96bc96506db3a4f8590ad602e4814c6d8fc5b8c
font_01_sfnt_off00017dbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DBD 11896 bytes
SHA-256: f81d8e3e90dcf90f90beba8bd9879ed7e4b1257442160fa24190bb0ccd35e50b
font_02_sfnt_off0001a620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A620 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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