Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb744d7c84fbcebc…

MALICIOUS

PDF

67.5 KB Created: 2021-03-08 10:39:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 78ec9d0fdb656a197c1a205935875ff2 SHA-1: 292b1bb4261ac227bc820d915dda80c287e99e7a SHA-256: fb744d7c84fbcebce8201e58d86f7661ff9c0cce1b0bb47cf6bdfeb76aed4c3e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs and is flagged as a link farm on disposable hosting, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment.

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 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://vilenefex.ru/award?keyword=baixar+catalogo+aje+pdf PDF link annotation
    • http://stat-index-co.com/54474133642eb9nb.pdfIn PDF document text
    • https://cdn.sqhk.co/jebavimot/iXS7ggh/tabipali.pdfIn PDF document text
    • http://shop50off.info/welajonuvesoxatevijigeeuaki.pdfIn PDF document text
    • http://libralab.digital/2000_chevy_s10_service_manual_free_download1nc4d.pdfIn PDF document text
    • http://arnautmebel.ru/subaru_pressure_washer_pump_oiliurfl.pdfIn PDF document text
    • http://weraka.online/eia_scoping_report_examplekomht.pdfIn PDF document text
    • https://cdn.sqhk.co/lediname/HUPjfhi/97145899941.pdfIn PDF document text
    • http://physcoo.com/what_religion_means_to_mewucqq.pdfIn PDF document text
    • https://cdn.sqhk.co/kavejufa/khbjiOR/13286288280.pdfIn PDF document text
    • http://community-day.ru/patitodogimeb9y48l.pdfIn PDF document text
    • http://pedugubugof.mywebcommunity.org/mezakoludofematuge.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e8677ced-6330-435e-8237-200fb10408a4.filesusr.com/ugd/a4c1fa_a21ee4fa69cf46798b9ee6f95b284643.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b109528-d2e1-4be3-8e67-883e80999cc3/2007_honda_odyssey_transmission_rebuild_cost.pdfIn PDF document text
    • https://e0bfa911-60eb-4c53-bd8d-ceec25156dfb.filesusr.com/ugd/0a052f_518d89e34a7649759f294ddcac5e09bf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5694b3ba-faab-4da3-af4e-e903f07c0e04/summary_of_the_house_of_spirits_by_isabel_allende.pdfIn PDF document text
    • https://c827806f-f9bf-4fd3-a4ce-e487c020fa79.filesusr.com/ugd/6fd45c_39f55010c95d4c7bbd48f4282b121196.pdf?index=trueIn PDF document text
    • http://kifesafijupesob.onlinewebshop.net/joxekakirakipojupibaje.pdfIn PDF document text
    • https://3485775d-af35-4505-8fb4-f6750f575e04.filesusr.com/ugd/42f18e_c36616e66415405c84c3127bc73afd3f.pdf?index=trueIn PDF document text
    • https://ad9e3d1f-bb22-46ca-892e-b6aa3325a756.filesusr.com/ugd/837d34_ddbf42df37be40f98dc64c8e8b6e1c8f.pdf?index=trueIn 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_off0000cb10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB10 5340 bytes
SHA-256: 2cc07f40b00341870bc3514d9de9388b107f839f9974010f426752edcd39e27d
font_01_sfnt_off0000dd59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD59 10492 bytes
SHA-256: 5a78e75a3e79aa32c2d46ee41b751efc351ff9462bd0667544ed3cb20e1514c5

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