Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2615cb5487663e4…

MALICIOUS

PDF

86.2 KB Created: 2021-06-05 01:34:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: c143359d7c34833e7d8bd27f3f649f00 SHA-1: c0d6ed3bec6f8d5d54d1521fc5361bde9b88e6d7 SHA-256: b2615cb5487663e4d47cecb8b76ed604824772c401c785be3d842903a7c517ff
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, characteristic of a link farm designed to obscure the final destination and potentially host malicious content. The presence of a critical heuristic firing for PDF_SEO_LINK_FARM and ClamAV detection strongly indicates malicious intent. While no scripts were extracted, the structure and URL patterns suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://garglob.ru/pbw?utm_term=grade+12+physical+science+textbook+pdf+download+study+and+master PDF link annotation
    • https://lamivorimu.weebly.com/uploads/1/3/5/3/135330715/xerogiwuruz-jeniwadopakosag-mofox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453914/normal_5fd32ce7e2123.pdfIn PDF document text
    • https://tatojevukud.weebly.com/uploads/1/3/7/5/137508330/9226518.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416798/normal_5fca046f31b92.pdfIn PDF document text
    • https://zudizobi.weebly.com/uploads/1/3/4/8/134860565/rokal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379363/normal_600ff1d979fdc.pdfIn PDF document text
    • https://jenodaxadow.weebly.com/uploads/1/3/4/0/134012655/tusize_tugobazuwuwo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482399/normal_6031ea3765457.pdfIn PDF document text
    • https://jemokufofek.weebly.com/uploads/1/3/4/3/134312150/nowojejumobuv.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/3183c6ad-e80e-4ecb-b3ea-b06bd7c8924c/69445034713.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/484f8aa1-b486-431a-bd6d-a34e2bfe337e/how_do_i_fix_my_18v_black_and_decker_battery.pdfIn PDF document text
    • http://redejok.pbworks.com/w/file/fetch/144520800/wedding_card_matter_in_english_for_daughter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88ecd455-afaf-4522-b3bd-d0aecc28d8af/77114231700.pdfIn PDF document text
    • http://kibumezi.pbworks.com/f/saoif_farming_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fb30878-69c6-4348-9c2f-56bb27b93387/25640910644.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b900b58b-d29e-4a3a-aa42-efa3780f4bf0/wagner_paint_ready_sprayer_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/455fb1b4-2236-4635-90f6-8448decae4b5/update_tomtom_maps_for_free_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c1370c9-d34e-4b3f-ab8a-c162119a167a/41929374625.pdfIn PDF document text
    • http://gapufipi.pbworks.com/w/file/fetch/144548475/collateral_transfer_agreement_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc154b05-6567-4cfe-a545-3f9312713d96/what_is_a_legal_last_will_and_testament.pdfIn PDF document text
    • http://pezaloribed.pbworks.com/f/81096962570.pdfIn PDF document text
    • http://jeveriwilum.pbworks.com/w/file/fetch/144600144/5296003580.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae75c49c-dd83-410b-81e1-fa10802df9e7/14638608671.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b16097c7-66aa-43aa-8c66-9edb581a6d58/lurajufepimorasalesamal.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_off00010f9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9B 6076 bytes
SHA-256: 15d52789b5b813b2148e1d2ad9adffa358c5bd14a2a779ab55bc3e0f3a631cc0
font_01_sfnt_off00012446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12446 11444 bytes
SHA-256: 807b14399d0e7e4fdda6835b86834cb18fe7e02818bd79500c86bed91b22d3d1

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