Malicious PDF — malware analysis report

Static analysis result for SHA-256 2975b4d09609c06f…

MALICIOUS

PDF

83.6 KB Created: 2021-10-22 17:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 3f6b125d05663143288287d6d67c325e SHA-1: a0bd05bf16f3fef14c6b2a8afaae2afdd3d48de0 SHA-256: 2975b4d09609c06fc81fd1bd5901265215c2909c3118505dfc25c562d4c9e02e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and contains embedded JavaScript. This JavaScript is likely responsible for downloading and executing a second-stage payload from one of the numerous external URLs found within the document. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of distinct hosts, suggesting a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kp-bs.ru/upload/files/pozanoda.pdf In PDF document text
    • http://traktor-tv.de/sites/default/files/file/judozivabovifidugegumevo.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/mosudeduguwinonoven.pdfIn PDF document text
    • http://scpt.it/userfiles/files/48583802919.pdfIn PDF document text
    • http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/30075692366.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/fojudibomodaja.pdfIn PDF document text
    • https://cebrigantina.com/025-CEB/images-editor/file/92435773336.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614045f26586b---vajejufumivobixeragi.pdfIn PDF document text
    • http://regmac.net/userfiles/files/tatodaxanije.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/zobimamotomon.pdfIn PDF document text
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/8793655602.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/bavejan.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/54653743351.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/tozaramoxegekavu.pdfIn PDF document text
    • https://adproissy.emailingmanager.com/uploads/editor/file/jekijekarorawuguva.pdfIn PDF document text
    • https://sambelteri.com/contents/files/rizinidakexizo.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/misuvidenija.pdfIn PDF document text
    • http://chargooshads.com/images/upload/files/vofiwopalebufakoxadajuduk.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/favavuzirera.pdfIn PDF document text
    • https://selispin.net/calisma2/files/uploads/73422435282.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16141e24690632---74342087156.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/suvifolofuv.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/felipepa.pdfIn PDF document text
    • https://acheapantheia.foliopic.com/1443703054.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/D9plVHj2VOU/uplcv?utm_term=conclusion+in+lesson+planPDF 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_off0000e1cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DE 18260 bytes
SHA-256: 5daf0554b40f7042a7057270cb9a6629f0cb3506121ff44731a20f4a2b1ae435
font_02_sfnt_off00012930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12930 10300 bytes
SHA-256: 91d5f3c81ffd6fbac448f0164738f606c6b7c72993b6f55d748b2325a46790a4