Malicious PDF — malware analysis report

Static analysis result for SHA-256 a80452d9bb0b85af…

MALICIOUS

PDF

74.4 KB Created: 2021-05-29 03:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 49df7d1143154a9d444795c310eed7a7 SHA-1: 5c72dae4906165c6f4f7f39237c3f2592887fd08 SHA-256: a80452d9bb0b85af4587c35521b2a0697868532aeb20308c3bbce90b36199a1f
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, and is flagged by ClamAV as a phishing trojan. The embedded URLs suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution. The document body, though heavily corrupted, contains text related to an audit report, which serves as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/123?utm_term=company+audit+report+format+in+excel PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4384644/normal_5ff49ef41befd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493589/normal_5fcc793aa63fd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464702/normal_5fe35818b9b9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412761/normal_601713dae7446.pdfIn PDF document text
    • https://xazujojupise.weebly.com/uploads/1/3/4/4/134493550/lidevatosajarodaw.pdfIn PDF document text
    • https://durozuxazoxete.weebly.com/uploads/1/3/4/6/134647509/5e3e4c417781cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488817/normal_600f4fc08a306.pdfIn PDF document text
    • https://nopirepogoduk.weebly.com/uploads/1/3/4/0/134095858/pagup-ladixomusavizun-genazosefut.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422373/normal_5fdefb6b3b76e.pdfIn PDF document text
    • https://fejimasonosiw.weebly.com/uploads/1/3/4/4/134476492/4ed2b46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416661/normal_602feba69b175.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a5ae3d0-b056-4a21-b198-98a2731c9ac4/95780346696.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05254b84-2e11-4ce0-85c1-fd921ce9b360/thompson_center_hawken_hunter_1x32_muzzleloader_scope.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcc46927-14d9-4c2e-8dda-03a345512a67/vipokofitiru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6557a9c3-abd1-40c2-aa57-3fdd15f46f06/71897328029.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83c10cae-79b4-4e75-bbdb-dbb86a3e60de/fluke_1507_insulation_tester_specifications.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bef8d093-8050-4b9c-b090-d5f4cd89af5e/bluejacket_ok_directions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b974c0d-aa9d-4671-a0b1-04ac3904d9c0/sat_chemistry_subject_test_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4bc2446-d468-4927-9438-8f900a30aea4/bridge_cheat_sheet_acol.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_off0000e7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BD 5196 bytes
SHA-256: 67695c3ee32fdb7e208062e2310e55ea44fa4a4549a81ca9dda33023f60a9adc
font_01_sfnt_off0000f962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF962 10384 bytes
SHA-256: f17d4367eb41f037d532c24911f789ce698d7735f408ca23cd6a88b806075cd4

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