Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe8d09d167206669…

MALICIOUS

PDF

79.5 KB Created: 2021-01-15 08:38:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: dbb78515c448f076cbebd04ee04e8432 SHA-1: 7642264359e128aa8100291b46491a0c5ef37d21 SHA-256: fe8d09d167206669a0c58e9f576c05cb660a1a6f1738fcaf1c9dd0258561658f
156 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a link farm, suggesting it is designed to host numerous external links. One such link, 'https://traffnew.ru/123?utm_term=eng+060+academic+literacy+combined+reading+skills+test+7', is embedded and likely leads to a malicious site. The ClamAV detection and ML classifier also indicate malicious intent, consistent with a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffnew.ru/123?utm_term=eng+060+academic+literacy+combined+reading+skills+test+7 PDF link annotation
    • https://xasatodifugo.weebly.com/uploads/1/3/4/4/134439571/3327786.pdfIn PDF document text
    • https://cdn.sqhk.co/lituxopevuk/rutheL6/bearded_dragon_for_sale_near_me_cheap.pdfIn PDF document text
    • https://site-1225804.mozfiles.com/files/1225804/fall_boys_unblocked_66.pdfIn PDF document text
    • https://cdn.sqhk.co/lukumuzu/ZighCgj/1273738201.pdfIn PDF document text
    • https://site-1166600.mozfiles.com/files/1166600/31199472659.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/celebration_church_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/dodetojuxopogizenizekimaz.pdfIn PDF document text
    • https://s3.amazonaws.com/jidosatikim/how_to_pray_the_rosary_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/gotijejaj/scm630bc_replacement_filter.pdfIn PDF document text
    • https://s3.amazonaws.com/vibove/nonprofit_financial_management_best_practices.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/xotekerulutenewawetuge.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_off0000f7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D1 5900 bytes
SHA-256: 9bb37f6999993228b5845efe892896b9163f277466acc4e0b32a4e37f12d1ab0
font_01_sfnt_off00010be5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE5 10904 bytes
SHA-256: 86e9d4faa30847331275db23484f9a505a4385b7b71b15118789e6c44a03de2e

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