Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bd1b3050eb96798…

MALICIOUS

PDF

86.4 KB Created: 2021-03-29 23:04:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 1a932b4e407a3ccfa8edcec41c63e5ab SHA-1: 3ebf45d45694544b928a82bab344e5d45f8efbc4 SHA-256: 3bd1b3050eb967983c3da9292e6304cd25c3d28cbfd55868ae66a60e2d9cd531
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and numerous external URIs point towards a tactic of overwhelming the user with links, possibly to obscure the true malicious destination.

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://jacksth.ru/strik?utm_term=setup+my+epson+printer+wifi PDF link annotation
    • http://startask.ru/bellini_touch_oven_manualbnand.pdfIn PDF document text
    • https://cdn.sqhk.co/pafevola/agdghjc/52939129457.pdfIn PDF document text
    • https://cdn.sqhk.co/xudapurofoz/rFehhgi/zone_ringtone_maker_app.pdfIn PDF document text
    • https://cdn.sqhk.co/xenivoronizu/gfEs6v4/vefakizilule.pdfIn PDF document text
    • http://best-ital.fun/the_beautiful_things_that_heaven_bears_chapter_summarypwyuo.pdfIn PDF document text
    • https://cdn.sqhk.co/tabewinudeka/byjczgc/6696884796.pdfIn PDF document text
    • https://cdn.sqhk.co/timadupak/fjggd6G/malosubowo.pdfIn PDF document text
    • https://cdn.sqhk.co/wotirixa/fKghkgc/vunafeke.pdfIn PDF document text
    • http://kartaidatodemeleri.com/63246109245gvegm.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzowadijavu/e1hhXq5/28726164860.pdfIn PDF document text
    • http://akillidestekbasvuruformu.online/57461344923di4wd.pdfIn PDF document text
    • https://cdn.sqhk.co/toxinize/yIXiaij/alarm_siren_sound_not_working.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2a082fd4-e93f-4b8e-9e59-408fa046b31c.filesusr.com/ugd/e334dd_34a970816da94d7e8b8362f2f4e8c836.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/37cea682-63f2-40f0-b877-c239997569d8/eaton_fuller_18_speed_transmission_oil_cooler.pdfIn PDF document text
    • https://2863666b-9d79-467d-9aad-9eeb6dafbdf2.filesusr.com/ugd/6ee3eb_116b5fb324ec4f0ba27002fc6e7fbe6e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9aa4756-86c0-4627-a34a-9e22ea1b88b2/is_the_little_prince_movie_based_on_the_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7d5db11-abc2-41ba-b7d8-52180e799f40/ukulele_chords_and_strumming_pattern.pdfIn PDF document text
    • https://5053e88e-9e18-4719-890c-32a1cca0295d.filesusr.com/ugd/411503_bd232c0e019546859092411e6c55bfab.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb27745b-e439-4ad0-9e4a-2ec60abf93b4/4606004575.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96bd79db-4545-4c6a-8719-d666604e7478/28461219469.pdfIn PDF document text
    • https://a519209a-2b0a-481f-9fe9-460c873bdc80.filesusr.com/ugd/270e53_10781ee8e39448a888176afba52763f0.pdf?index=trueIn PDF document text
    • https://1c92f6d8-19eb-429c-9239-1cf6be91372f.filesusr.com/ugd/cc1a03_90890b1d08ce4e26a18f51737bd44dc6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcc528b0-ae1a-42c5-88f5-1d7294cd9438/13854046543.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e73f2665-f4cc-4343-948b-9c0151e5fd2d/mercruiser_4.3_oil_filter_relocation_kit.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_off00011540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11540 5100 bytes
SHA-256: b5d86d00e10df9e74bbff1e692bf2d6416afdcf1fdc18adf5bafa5d4a43fdb9c
font_01_sfnt_off000126a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A2 11152 bytes
SHA-256: 661e3fee45593da19254a8670026407ccb5c71ab53463318b63abe19a7c38910

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