Malicious PDF — malware analysis report

Static analysis result for SHA-256 b68d736cba667ded…

MALICIOUS

PDF

87.0 KB Created: 2021-03-16 18:28:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 31affccb9231cdfdbd64d45185573ca0 SHA-1: f1e0e73417f490aa94965b0e8a46528fbaca2306 SHA-256: b68d736cba667ded9ff6c5e320a066c6b22c668b9ea2da3908a84649d89b7a98
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm or SEO spamming operation. ClamAV detected this file as 'Pdf.Phishing.Trojan', and a machine learning classifier also flagged it as malicious. The presence of multiple external URLs, including one pointing to 'zajinet.ru', suggests a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/award?keyword=sample+promissory+note+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4479906/normal_60493a802dc13.pdfIn PDF document text
    • http://bositozibab.getenjoyment.net/easy_friendship_bracelet_instructions.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370062/normal_60482a0e9d4d5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375885/normal_5ffa3b5757c89.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445726/normal_5fcedf502ba2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413005/normal_603e46aaae172.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421042/normal_5ffd2465e5e55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391954/normal_600a41b7d2359.pdfIn PDF document text
    • https://kawawipebezuvo.weebly.com/uploads/1/3/1/4/131409621/1233203.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472793/normal_601b0c08f1df0.pdfIn PDF document text
    • https://rosavipufek.weebly.com/uploads/1/3/5/3/135315232/jupot_rejivibawu_bowinojadis_zidubole.pdfIn PDF document text
    • https://lopamazaveseku.weebly.com/uploads/1/3/4/6/134643240/filosunawusaf_gizife_nokad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424692/normal_60242f1be3551.pdfIn PDF document text
    • https://gavebinakufir.weebly.com/uploads/1/3/2/3/132302735/4254872.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://puzuritutu.rf.gd/bienestar_animal_unam.pdfIn PDF document text
    • http://daximogosamov.myartsonline.com/rc_plane_plans_free.pdfIn PDF document text
    • http://gumimuve.epizy.com/bombay_movie_naa_songs_free.pdfIn PDF document text
    • http://muvemaxadal.onlinewebshop.net/agro_ecological_zones_in_sri_lanka.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_off0001142f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1142F 5392 bytes
SHA-256: 942c72b6b53282ce4cea747ccea91e108a9cc02c1100b691713bd4bfb44b06cd
font_01_sfnt_off00012673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12673 11412 bytes
SHA-256: 2d7d889d40a43f39b2c09108305622a54e3cd28c64f239b604eeebc25dcde24e

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