Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fc1fffdba4329e3…

MALICIOUS

PDF

67.4 KB Created: 2021-02-26 21:23:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: cda470662a38c0f064509e7d5ff605d4 SHA-1: 28e639d4377ea0237ed5ee484681797ba8b810bd SHA-256: 9fc1fffdba4329e3610561dc0619d1f7cc2ecd3adc4ba72173f6847d8916f51c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with the primary URL being a lure for search engine optimization or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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://xezojetit.ru/award?keyword=how+to+get+rid+of+%25231+best+friend+on+snapchat PDF link annotation
    • https://cdn.sqhk.co/zanivuwiduvo/yVxzugi/how_to_get_superhero_mods_in_minecraft_pe.pdfIn PDF document text
    • https://cdn.sqhk.co/renonidofel/etjgjjm/personal_assistant_salary_san_francisco.pdfIn PDF document text
    • https://cdn.sqhk.co/raxoxawupej/gx2VhgY/24745787087.pdfIn PDF document text
    • http://loduwij.scienceontheweb.net/27469254824.pdfIn PDF document text
    • https://cdn.sqhk.co/xororofomed/hdgchb3/gogo_live_apk_mod_terbaru.pdfIn PDF document text
    • https://siwinapevaz.weebly.com/uploads/1/3/4/3/134338690/gimuxepabogiket.pdfIn PDF document text
    • https://cdn.sqhk.co/nefakovuwot/ifieQ0G/metallic_green_bubble_mailers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gafodix.myartsonline.com/21204624261.pdfIn PDF document text
    • https://s3.amazonaws.com/nevowimo/28769915813.pdfIn PDF document text
    • https://s3.amazonaws.com/wozoxub/prince_of_persia_apk_revdl.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_off0000ce8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE8C 4708 bytes
SHA-256: a926da1a3b4c4fe2d2dba0539025a3bdd0509284adc1a069aee939be0359e5b1
font_01_sfnt_off0000deb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB6 10276 bytes
SHA-256: 647f12782046cb1b31cc5dddf221877b244ad8683ed4d83348ecdb88d877c787