Malicious PDF — malware analysis report

Static analysis result for SHA-256 5961e02a14166f26…

MALICIOUS

PDF

77.3 KB Created: 2021-10-06 12:03:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4235486dae90088306aed7d3472faf17 SHA-1: 2ceaf8948fc3c5f60d0e9cad640c52ca873fc428 SHA-256: 5961e02a14166f2696597e201ac360ca4bab2b4a23d5e247b20ee8989783699f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged by heuristics as a link farm on disposable hosting, indicating a phishing or SEO manipulation attempt. ClamAV detection and ML classification confirm its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it is designed to redirect users to malicious content, likely for further exploitation or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://guchen.ru/d/files/8304409808.pdf In PDF document text
    • http://wittlich-luexem.de/userfiles/file/ramisonatasexurojawire.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/rifijevutidovukego.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1615389832353a---91552392408.pdfIn PDF document text
    • https://gkscam.com/userfiles/file/89407284143.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/39719975743.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/jifuviwubemizajazapifikem.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/40911996738.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/75186485750.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/14/file/43202328138.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/85031820601.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/boputuwivu.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/bce3cf2dab259f6180168b7d4ee0e36b/2779761601.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/88988586790.pdfIn PDF document text
    • http://clerus.hu/files/file/gopowudi.pdfIn PDF document text
    • http://kleinschadenexpert.de/userfiles/file/79037690044.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/fasuwigokedul.pdfIn PDF document text
    • http://hkwwta.org/userfiles/32858235827.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/35282361084.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/161408755be842---23191278477.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210902_486A8BDC71E50CDD.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/67749796614.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/31442601772.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=willy+wonka+slots+hackPDF link annotation
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/67030550699.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://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_off0000c5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD4 10380 bytes
SHA-256: 2ae33abd56c5c890f466bac14c4255338347698a0b661ce5d239bb2aaa2922e6
font_02_sfnt_off0000f551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF551 19000 bytes
SHA-256: a073e6c06cf5cdf8742f8116ab711c699956a854d12622eacc5c0ce62532ebac