Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdacb8f73a6873ad…

MALICIOUS

PDF

95.2 KB Created: 2021-06-06 00:24:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: a106033e4cc481ec9b2b122fbdc1d256 SHA-1: e9753223d70ed903e52fca24dfebfa27a2082325 SHA-256: cdacb8f73a6873adb3ef01c8e42fac5621b87398bb25781c2254e422bf8c7ab1
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains an embedded URI pointing to 'laborke.ru', which is likely a phishing or malware distribution domain. The PDF structure and embedded content suggest it is designed to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://laborke.ru/pbw?utm_term=plate+girder+bridge+design+example+pdf PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6157e93d-7323-4efe-907f-ed9bc45ea651/ruger_p95dc_recoil_spring_assembly.pdfIn PDF document text
    • http://mikabipi.pbworks.com/w/file/fetch/144577959/81118985394.pdfIn PDF document text
    • http://wenuveraroto.pbworks.com/w/file/fetch/144686892/exploring_microsoft_office_2016_volume_1_exploring_for_office_2016_series.pdfIn PDF document text
    • http://pagorevet.pbworks.com/w/file/fetch/144472533/tinubutunabefikivudogibaj.pdfIn PDF document text
    • http://buwutel.pbworks.com/w/file/fetch/144686772/2003_jaguar_x_type_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52a8dcd0-5baa-45fd-a34e-6456e29aad70/30905099183.pdfIn PDF document text
    • http://ruxafonan.pbworks.com/f/44282065427.pdfIn PDF document text
    • http://jaxonewu.pbworks.com/f/vubawazemoxudum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8c0a058-218f-48a8-8de9-5568e9ac11fd/zuvaxawowodit.pdfIn PDF document text
    • http://kivotin.pbworks.com/w/file/fetch/144550875/murder_mystery_books_for_7th_graders.pdfIn PDF document text
    • http://pinurakus.pbworks.com/w/file/fetch/144532359/62517162636.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/365b67dd-17d5-4b5e-9e14-797b75b02c93/manomibafulavidaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4df89e4-e90e-4d18-b575-4d4f866d490a/89210469991.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/149a8673-94c1-4284-ae36-209e2e3cb67a/47706098379.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92450cab-156b-4958-8551-627314430539/81231399609.pdfIn PDF document text
    • http://lomubel.pbworks.com/w/file/fetch/144576282/one_piece_manga_reddit_chapter_1.pdfIn PDF document text
    • http://biwonuv.pbworks.com/f/luigis_mansion_dark_moon_3ds_walkthrough.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73e80582-0b50-484f-bd31-d0e1313e5103/el_pollo_loco_classic_chicken_salad_nutrition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3a51235-973c-4019-be4e-4daaafa20ccf/jigozujiboxitosesagiti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34d7c425-ad8c-4b16-acdc-51e48ac40d40/34962232348.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/180803fa-1f8d-4172-a708-e85045b077b6/31103068157.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_off000135d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135D2 5568 bytes
SHA-256: 722f041a0e7d7245c18f3b3675808bb71455f498ba61b1e4cb8afab5e9c88747
font_01_sfnt_off000148b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148B1 11480 bytes
SHA-256: eb11dca5be9628ebe090da9dd65a039a05782d720cab304a42b0924c248e63db

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