Malicious PDF — malware analysis report

Static analysis result for SHA-256 db7d330a2645840f…

MALICIOUS

PDF

68.2 KB Created: 2020-11-23 20:43:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: b51beafefd713e107fc6ef051a3b8005 SHA-1: 7383e3fa36e01c4ad31c8338db982ed788263af3 SHA-256: db7d330a2645840fa8af22c8214871dd8d54a352ccfca3b7760bc19c80968ecf
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a 'PDF_SEO_LINK_FARM', with one prominent malicious URL pointing to 'traffset.ru'. ClamAV detection and ML classification strongly indicate malicious intent, specifically classifying it as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

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 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.
  • 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://traffset.ru/123?utm_term=tool+nose+radius+compensation+formula PDF link annotation
    • https://bavibexovapow.weebly.com/uploads/1/3/4/6/134643610/c99ccf80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367311/normal_5fa1c094089ae.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/0506479c-085e-411b-b566-ebc41d9e6f8e/kivebiworowosikakudebev.pdfIn PDF document text
    • https://s3.amazonaws.com/nagev/semusekogisavuzege.pdfIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/minecraft_mods_and_addons_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/fejatepudopito/47114299571.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/lutumogizopafesapa.pdfIn PDF document text
    • https://s3.amazonaws.com/nitatotol/guidelines_for_management_of_acute_appendicitis.pdfIn PDF document text
    • https://s3.amazonaws.com/kukazowox/ucsd_at_your_service.pdfIn PDF document text
    • https://s3.amazonaws.com/jopomodilamego/25889201870.pdfIn PDF document text
    • https://s3.amazonaws.com/nopomewegobij/appvn_apk_for_android_new_version.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/swarthmore_college_newspaper.pdfIn PDF document text
    • https://s3.amazonaws.com/jiguwuzobozobaz/tugisumupogibogumen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2560deee-aac6-45d9-8ae0-59e53b54c6bd/bumoz.pdfIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/ciclos_de_vapor_de_carnot.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_off0000cce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE0 5248 bytes
SHA-256: 2f8ada7334f1de06fa1b07f5280c822354b7e01d065ebc8fc8960b9affa7d1b5
font_01_sfnt_off0000de9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9F 11700 bytes
SHA-256: 3230ab3ae275ed3c22c7030bd6fa8cb83f5a82696f22013eac8049cf2a027398

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