Malicious PDF — malware analysis report

Static analysis result for SHA-256 321834d4365890c5…

MALICIOUS

PDF

80.3 KB Created: 2021-04-16 19:52:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: b8a2503f2e6ce880d7f0cf7d7719fa53 SHA-1: 1952f8468a2e972a398e344286f8b7818be5a39d SHA-256: 321834d4365890c535d0caec418dd66f0e06bcb0309f15a224c78114eb44bfda
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO poisoning attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded URLs, such as https://jottigo.ru/strik?utm_term=christopher+hitchens+quotes+on+death, are likely used to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jottigo.ru/strik?utm_term=christopher+hitchens+quotes+on+death PDF link annotation
    • http://pevazaw.mypressonline.com/rebalotigenej.pdfIn PDF document text
    • http://xexapitanegis.getenjoyment.net/wuzepepeba.pdfIn PDF document text
    • http://bawimip.sportsontheweb.net/difference_between_monocot_and_dicot_stem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407729/normal_603dfca13ed9e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493610/normal_5ff7a67eddd08.pdfIn PDF document text
    • http://kujunat.medianewsonline.com/35942483900.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388426/normal_60559cc92b65a.pdfIn PDF document text
    • http://ch-bewertung-2888.xyz/will_draw_upon_synonymayof5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495685/normal_5ff27543941ab.pdfIn PDF document text
    • http://ostanni.fun/fokikofawm0o9f.pdfIn PDF document text
    • http://rixorevu.getenjoyment.net/pigarexajononebew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415767/normal_5fd820d2ecc03.pdfIn PDF document text
    • http://premiumpornclips.com/video_instagram_app_ios3j0w1.pdfIn PDF document text
    • http://test123test.xyz/claim_battle_pass_tokensqhmba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/clinical_practice_guidelines_spasticity.pdfIn PDF document text
    • https://s3.amazonaws.com/lawakux/xenekefutezonenuliv.pdfIn PDF document text
    • https://ac402fee-74f4-49a6-b5a4-6a03c6a057de.filesusr.com/ugd/b0cd75_a3f05cfc712e4dd0a6184bbd506c7041.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/runuzitexokol/car_games_for_pc_windows_7.pdfIn PDF document text
    • https://9b704b87-3668-414c-a24e-b30400fe0e33.filesusr.com/ugd/51c472_6cb7927fecef46c88b7cf9d058d93549.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fofeguj/41093194730.pdfIn PDF document text
    • http://nejesezape.myartsonline.com/vugolapowizogewerajobipor.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/apple_airport_extreme_a1408_manual.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_off0000fdcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCC 5160 bytes
SHA-256: 54e50a68816ae380cb461e2c7ba564c844bbc76036ee29024491474b642ecde9
font_01_sfnt_off00010f44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F44 10704 bytes
SHA-256: a8ece0ae7e78ef6aa0700b5e79521a2e4390b4b34f2bd99d80b3971b8450865b

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