Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e4a5de2c0bd1d12…

MALICIOUS

PDF

99.0 KB Created: 2021-04-25 22:45:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: d5f6ac5be977412db6e67aaa0646b481 SHA-1: c6c9086afa2384cafad59af6ceb883edea08020c SHA-256: 9e4a5de2c0bd1d12b831d3c8855368c3e2fdcd5f710d9d6eb8bf720aa03a1c04
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 pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and numerous external URLs are indicative of a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://kuzutuzo.ru/strik?utm_term=list+of+sins+in+the+catholic+bible PDF link annotation
    • https://mixusabap.weebly.com/uploads/1/3/4/0/134096097/4678084.pdfIn PDF document text
    • https://cdn.sqhk.co/wofunukasu/sfghWqH/28079601226.pdfIn PDF document text
    • https://pagopolekabob.weebly.com/uploads/1/3/4/3/134305888/vumokuza.pdfIn PDF document text
    • https://sekeratogo.weebly.com/uploads/1/3/4/6/134683690/futipudo-xiriwodudom-vefikejiba.pdfIn PDF document text
    • http://zagavexakagin.mypressonline.com/53915961057.pdfIn PDF document text
    • https://cdn.sqhk.co/sileluzorupo/IjhRgwj/87027989623.pdfIn PDF document text
    • https://cdn.sqhk.co/revujinarewu/icD1sje/flying_bee_robot_car_transformation_game_robot_games.pdfIn PDF document text
    • http://rezubodojel.medianewsonline.com/53945759502.pdfIn PDF document text
    • https://pupagabizazupi.weebly.com/uploads/1/3/5/3/135314982/mebupiwiweb-vutugejaniju-zikipuxe-deganoketezif.pdfIn PDF document text
    • http://surupumigo.mypressonline.com/vinawonagafiridozuxo.pdfIn PDF document text
    • https://cdn.sqhk.co/pijavagoke/qbic8KO/bollywood_video_songs_new_bollywood_songs.pdfIn PDF document text
    • https://buketopol.weebly.com/uploads/1/3/4/0/134013372/pujej.pdfIn PDF document text
    • https://zorisurirumu.weebly.com/uploads/1/3/4/6/134600588/zerizagusu.pdfIn PDF document text
    • https://fubapisa.weebly.com/uploads/1/3/1/4/131406294/lotutizaz.pdfIn PDF document text
    • https://riligisivimi.weebly.com/uploads/1/3/5/9/135992895/zazek.pdfIn PDF document text
    • http://balegetiwep.mywebcommunity.org/motuwel.pdfIn PDF document text
    • https://julalawigito.weebly.com/uploads/1/3/4/8/134869680/4071989.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/kudamomerixubimur.pdfIn PDF document text
    • https://s3.amazonaws.com/dapekufoxiraku/financial_reporting_standards_australia.pdfIn PDF document text
    • https://s3.amazonaws.com/zukogi/slideshow_template_ae_free.pdfIn PDF document text
    • https://83bd47e3-138d-48d8-8d00-514fe13b91b0.filesusr.com/ugd/c87a2f_b917ba8a8e1842439f3a35dd826a52ca.pdf?index=trueIn PDF document text
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_97d91de72f394ac18c72aedacbde2b34.pdf?index=trueIn PDF document text
    • https://db532842-334f-4efb-8993-e67ec8f20ff5.filesusr.com/ugd/bc5be3_a985f8c009f849dd8b534adb30ae7436.pdf?index=trueIn PDF document text
    • http://bigamutalunu.atwebpages.com/98891047873.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000139a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139A0 4740 bytes
SHA-256: f4413d947455a8dadec9c5cd478f71055a79f23eba1c9a19e08d60fc8b0095f8
font_01_sfnt_off000149ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149AE 10872 bytes
SHA-256: 9459b596960b2cee5d5b852e83805b8fb4dac9801c9bbb52270dc3429486eb24
font_02_sfnt_off00016ed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16ED0 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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