Malicious PDF — malware analysis report

Static analysis result for SHA-256 b962db6a2f944adc…

MALICIOUS

PDF

70.3 KB Created: 2021-10-03 20:58:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5db718601c7b100ea15409fa29b27b99 SHA-1: 363847bfcb7fdcec12325044ea8c69c4abae52f0 SHA-256: b962db6a2f944adc9fada25f2ec93183ad3fce4fd9421464f2aa31925c139492
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. The embedded URLs point to various domains, suggesting an attempt to redirect users to potentially harmful content. While no scripts were directly extracted, the nature of the link farm and the detection as a Trojan point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16144e6ce5cbad---gawexewuzonorajivej.pdf In PDF document text
    • https://campermagazine.tv/public/file/88405408602.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/vaxagezamar.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/81407034289.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/77690226104.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/gojogaloju.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/97631651337.pdfIn PDF document text
    • https://shunnasato.com/23547253264.pdfIn PDF document text
    • https://kovrdom.ru/sites/all/sites/default/files/file/36818559504.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/vowajitotixudulipi.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210927021236_ga1fkh.pdfIn PDF document text
    • http://hairandoil.com/uploads/84369626588.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368fd7e946b---27869417099.pdfIn PDF document text
    • https://ferropula.hr/files/roxigawogenegowakog.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/69598526378.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202109201138215816.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/23045036805.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/77211423879.pdfIn PDF document text
    • http://air-separation-supplier.com/d/files/robika.pdfIn PDF document text
    • https://rn62ug59c-to8.com/contents/files/28981202606.pdfIn PDF document text
    • http://zhongyuemedia.com/filespath/files/20210925115207.pdfIn PDF document text
    • https://micsys.in/userfiles/file/lifudajuxozuzufoten.pdfIn PDF document text
    • http://alvitraders.com/files/60499506960.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/dinirugikatifaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=high+antral+follicle+countPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b2d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D9 10540 bytes
SHA-256: 9cf406a88c2b5fe2c979234e14447467665b6fe12b4cc469961e2cf449d1a45d
font_01_sfnt_off0000cac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC0 15904 bytes
SHA-256: 8c0ee3cd25f0835709ee60cf80a47d98ee2e56dd64da835485186412c0c2b465
font_02_sfnt_off0000f35c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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