Malicious PDF — malware analysis report

Static analysis result for SHA-256 8602032310757a84…

MALICIOUS

PDF

75.6 KB Created: 2021-03-24 14:22:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: fdcd1ac29e262fe51948268b4b7b06a0 SHA-1: 72ee5121f5533b912b480127477bf3683cdf2d50 SHA-256: 8602032310757a8460b1504107e63bab0d6770fb7c9723a65b673a8c85181637
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, https://vilenefex.ru/award?keyword=application+software+book+pdf, is a primary indicator of this malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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://vilenefex.ru/award?keyword=application+software+book+pdf PDF link annotation
    • https://cdn.sqhk.co/torujazelome/caz3rjf/high_school_escape_2_level_4_walkthrough.pdfIn PDF document text
    • https://cdn.sqhk.co/fogunedevare/zjjftyI/86401137934.pdfIn PDF document text
    • https://pexasojurez.weebly.com/uploads/1/3/1/3/131381046/kilirev.pdfIn PDF document text
    • https://rifubagozoj.weebly.com/uploads/1/3/2/6/132695416/kinafa-tavowi.pdfIn PDF document text
    • https://cdn.sqhk.co/depadukat/jgihfib/apps_that_give_you_free_stuff_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/govibabika/fFhiKOF/24635953886.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450036/normal_6036ac16ddf65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483587/normal_601a9d0975c5c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373519/normal_5ff9e80379fb2.pdfIn PDF document text
    • https://guxojifupu.weebly.com/uploads/1/3/1/4/131438233/rokuse-lubujijipona-jujurujatam.pdfIn PDF document text
    • https://cdn.sqhk.co/fasotaluvose/eihpqha/lamorogozuforodonudolofa.pdfIn PDF document text
    • https://cdn.sqhk.co/zulatobi/jaB39hj/wakudu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496391/normal_5fd97110e1e93.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvexajamu/jiirjae/pirixafavafukepe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392195/normal_5fe70666534a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426408/normal_60170d357a837.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402710/normal_5ff4215ed9bda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379241/normal_5fd935ee9c34c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485162/normal_6044cbaa040c4.pdfIn PDF document text
    • https://cdn.sqhk.co/wavudasawete/gjheKia/doomsday_on_demand_2_unlocked_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/timafewa/bUIDE5D/pibebupumubapogokufu.pdfIn PDF document text
    • https://cdn.sqhk.co/lowilufape/jjciLii/vesoribimovobarasajoga.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459631/normal_5fdd2fa54f267.pdfIn PDF document text
    • https://lusezatakobav.weebly.com/uploads/1/3/4/3/134352635/gitenebogovowixeso.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/f85ac30d-ad5e-4474-8906-9ebedbbafe01/redmi_note_4_screen_replacement_cost_in_chennai.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad57d99c-d48d-431b-91a4-986a5b359d2d/optiplex_390_size.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b847f5e-37cc-4111-958a-cbd3cf13a511/20538509456.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_off0000ebd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD5 5432 bytes
SHA-256: 36b40c9d99caab46ed2681f49fd61dc7bb505c4c3dfd92480b8ce80c437de2d8
font_01_sfnt_off0000fe71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE71 10036 bytes
SHA-256: 73cbf8bb3d3806b7e8b2426e7812065393f2a1d298cbe43ce61d4c4b5466e410

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