Malicious PDF — malware analysis report

Static analysis result for SHA-256 a70a46f09e795a01…

MALICIOUS

PDF

81.8 KB Created: 2021-03-12 09:13:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef72eceadc2e047e51c8c76a24486238 SHA-1: 5363cae7712938501903b9a536e0f489e80f9f4a SHA-256: a70a46f09e795a01602f31880cfc20e40b718266ecadecebc681bba7437c9c2c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated and appear to be part of a link farm for SEO manipulation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links. No scripts were extracted, but the PDF structure itself is designed to drive traffic to potentially malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=plano+metro+y+cercanias+madrid+pdf
    • https://cdn.sqhk.co/gatavikap/mBifSVl/tijoruwap.pdf
    • https://cdn.sqhk.co/masamiwe/ii0jeGs/shark_puppets_real_name.pdf
    • http://jiwujat.iblogger.org/29327034313.pdf
    • https://cdn.sqhk.co/kelopifagisu/3acWlGh/eso_stone_giant_changes.pdf
    • https://cdn.sqhk.co/xijodepub/dhhiehh/pidugavovokukuso.pdf
    • https://zavuvomexuwu.weebly.com/uploads/1/3/2/7/132740545/jejazubopol.pdf
    • https://cdn.sqhk.co/surudije/bjctUje/tuzojivavudufezuli.pdf
    • https://xezefamije.weebly.com/uploads/1/3/4/3/134352880/7043520.pdf
    • https://cdn.sqhk.co/rapawomo/chgdhaD/36795471674.pdf
    • https://cdn.sqhk.co/zavipudajose/hg4jeii/best_video_player_apk_review.pdf
    • https://cdn.sqhk.co/pujixefan/QUAgjic/zawokoxodazumixixe.pdf
    • https://cdn.sqhk.co/jaxogubajo/Vii8ieg/fozeluvoxigoki.pdf
    • https://cdn.sqhk.co/lasukojizix/3Vmjhmj/car_accident_reports_today_san_diego.pdf
    • https://cdn.sqhk.co/jivazufevi/idghkFX/game_of_sultans_vizier_level_colors.pdf
    • https://cdn.sqhk.co/zalopubid/9hbBgcn/94916683737.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://duzifif.epizy.com/53040031683.pdf
    • https://s3.amazonaws.com/pegozegi/chupke_chupke_movie_shahid_kapoor.pdf
    • http://guvivel.rf.gd/25362960368.pdf
    • https://s3.amazonaws.com/jakujakula/lipugukof.pdf
    • https://s3.amazonaws.com/tanapilamaxi/cleaning_services_leaflet_templates.pdf
    • http://bajewilogofiro.epizy.com/mcgraw_hill_social_studies_textbook.pdf
    • https://s3.amazonaws.com/wutezigojuxi/edible_oil_refinery_process.pdf
    • https://s3.amazonaws.com/rixevozajixezos/dunkin_pumpkin_spice_iced_coffee_nutrition.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100c8.bin
796dc6c65c5880d5b86dd52c2693f681416740fcb53a9b7a4bfdfd75f49491b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100C8 5404 bytes
font_01_sfnt_off0001131c.bin
d0f28e7c0b5896aa400143c7f5d5178f340d59d568be7115a9a32c857797e327		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1131C 11772 bytes

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