Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1c3dada44de7836…

MALICIOUS

PDF

76.5 KB Created: 2021-09-19 23:11:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 051a7afb3a356a0d477032d6416f3729 SHA-1: 5453ade9121f0caab23a15e18377ec989978bd3c SHA-256: a1c3dada44de7836f4a5e1d7a86acc1155802ca3b351feacc7877e6d3ee58d5c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to various domains, suggesting a phishing or link farm attack. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a strategy of using many low-reputation domains to host content, likely to evade detection and distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 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://ketchas.ru/uplcv?utm_term=stock+market+games+for+android PDF link annotation
    • https://gangwontaxi.com/FileData/ckfinder/files/20210914_6B3EBC40CE4A5192.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/77528641661.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/62117698692.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210906_D7A31ED9EEDED13F.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/51ot4i555q93j9i1hvmf22eij5/tidokamagula.pdfIn PDF document text
    • http://sun-tes.ru/files/file/68752169649.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/46666981541.pdfIn PDF document text
    • https://r4binsh4h9-att.com/contents/files/74889151598.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/15078191455.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142f029c221e---95675924369.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/63256987354.pdfIn PDF document text
    • http://comitatoamiantovelodromo.org/userfiles/file/31156953419.pdfIn PDF document text
    • https://888nv.ru/userfiles/file/futegifaga.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/31564054862.pdfIn PDF document text
    • http://flapboxes.custompackageboxes.com/userfiles/files/34502058736.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/tumilovepuserunofajal.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/xawiwanumaje.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/22332555095.pdfIn PDF document text
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/93878536853.pdfIn PDF document text
    • http://nscenter.cn/upload/files/gubosiwavoweve.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/berosanazulekir.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/zoker.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/2464129716.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/51029880818.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/joduludaluwelavexasarelib.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://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_off0000c7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e00d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00D 16904 bytes
SHA-256: 22dd3324cc623b404f47b5d3f26e3a0629fca04be4e629ea94b4e370452fc429
font_02_sfnt_off00010b75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B75 10940 bytes
SHA-256: f37125ae02207f0e731fd765a8c8a817db28d5afe6faf5eb8fa67b0348a57e34

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