Malicious PDF — malware analysis report

Static analysis result for SHA-256 1da7e584459d5308…

MALICIOUS

PDF

73.0 KB Created: 2021-10-08 07:00:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1160f5f34d79549be1536a193b8e4e43 SHA-1: 854a0a869d0ce6296091ebf012654956b6e0ae6e SHA-256: 1da7e584459d53087aa3203cb8583ef72f0915b026d10903cca798cae0d7b3ee
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates it contains a large number of links to other PDFs hosted on disposable domains, suggesting a link farm or SEO abuse. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://budka39.ru/files/kanoderavefevenegafip.pdf In PDF document text
    • http://pincesorvarshop.hu/editor_up/21059402249.pdfIn PDF document text
    • https://rafaellopezehijo.com/upload/files/merinezojotawusezesuwuro.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/64364531586.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/quolfb1tqbcl05thkqeb1sjo20/10191208028.pdfIn PDF document text
    • https://iwanbim.iwan.co/userfiles/files/62770319441.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/vutupumivipijaposogape.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/xeniwoda.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/91762871518.pdfIn PDF document text
    • http://lola168.com/uploadfiles/file/3796130966.pdfIn PDF document text
    • https://mayersoffice.com/userfiles/file/pukirixiguramulafugepalur.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021092302050273499.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/wofekuzodupawetivubobuwed.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/muzedegeli.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/43345808272.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/mokew.pdfIn PDF document text
    • http://yuhuimachinery.com/d/files/53756875300.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/subatuxori.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/zumobakupitute.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/161582c5cc0ebc---91453834257.pdfIn PDF document text
    • http://world-spa-resorts.com/dok/75463406789.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/boputevuputofuj.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42579537928.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/86559363859.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=some+answers+to+interview+questionsPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC84 10696 bytes
SHA-256: 26abd7cc86658e240a694c4e7d2dacdbe89d05b6b0ba7a9f32d63342913c2555
font_01_sfnt_off0000d522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD522 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED34 16308 bytes
SHA-256: 50182d3607734205da9a63102e7c5329a60dfa4ad88226b38ebcb25551c2e554

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