Malicious PDF — malware analysis report

Static analysis result for SHA-256 5543766f5120a1f3…

MALICIOUS

PDF

66.5 KB Created: 2021-03-26 07:50:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 3a970d195bd3b91889fcc08103e41d20 SHA-1: 29f60eee8fc371ab8f88135417ce66c07f19a966 SHA-256: 5543766f5120a1f38499e9643f86e7a1c77224fc32de7ee79cf8c1053bb423ac
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a phishing or malware distribution campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is a link farm on disposable hosting. No scripts were extracted, but the overall structure and URL distribution strongly suggest a malicious 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 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://gimoguvi.ru/strik?utm_term=triangle+congruence+practice+answers PDF link annotation
    • https://rinedasufuketon.weebly.com/uploads/1/3/4/3/134340565/2758699.pdfIn PDF document text
    • http://noverst.xyz/60878743825an1ta.pdfIn PDF document text
    • http://trells.space/exercise_bike_weight_loss_transformationmx0jv.pdfIn PDF document text
    • http://rameautbxy.space/busidegozenemaniravedeov6v1.pdfIn PDF document text
    • http://private-channel.site/naruto_senki_full_characterwir52.pdfIn PDF document text
    • http://henrysavbr.site/64178393612tx8e8.pdfIn PDF document text
    • https://xemizumelisiga.weebly.com/uploads/1/3/1/8/131856695/7524166.pdfIn PDF document text
    • http://pokemonrivals.online/little_house_on_the_prairie_actors_who_have_diedxnotv.pdfIn PDF document text
    • http://bigno.space/25049674701nj4oy.pdfIn PDF document text
    • http://lolkek.xyz/zizufavixatocui9t.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/abb07137-5720-4854-9627-059416cb56e7/32085106762.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcef432d-216e-45d9-a1f0-107049a29c0e/32050134195.pdfIn PDF document text
    • https://s3.amazonaws.com/sukedil/2224990052.pdfIn PDF document text
    • https://s3.amazonaws.com/jaxesabi/twitter_apk_android_4._4._2.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_off0000c982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC982 5144 bytes
SHA-256: fc1e72d32ff8485cce4708a958111076673f553eef620766b09453f543e79338
font_01_sfnt_off0000db22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB22 9920 bytes
SHA-256: edac32871f599461ad19514a99ae568751aca6369ce211adb6c0dde47808243a

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