Malicious PDF — malware analysis report

Static analysis result for SHA-256 c98d51e7b3ec6d64…

MALICIOUS

PDF

89.4 KB Created: 2021-01-10 16:52:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 9ebb1f05ad23d408bd398c3e76223d1c SHA-1: aa8fb0c62aa8502f15118a52628772b3ad75fa2d SHA-256: c98d51e7b3ec6d6419d6c37f1bb7395be7b9be744fd7b358bcefd06ffd4d8948
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, including a link farm heuristic, suggesting an attempt to direct users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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/aws?utm_term=index+laws+worksheet+grade+9 PDF link annotation
    • https://site-1168177.mozfiles.com/files/1168177/batman_arkham_asylum_for_pc.pdfIn PDF document text
    • https://site-1166749.mozfiles.com/files/1166749/halloween_costume_store_around_me.pdfIn PDF document text
    • https://cdn.sqhk.co/lanumakefu/4ja93mY/saxuzowidi.pdfIn PDF document text
    • https://gibitiwatu.weebly.com/uploads/1/3/0/7/130776060/pinitifedojes_betowudokinezav.pdfIn PDF document text
    • https://cdn.sqhk.co/salenasova/JihXhdk/super_adventure_kart_dash_iso_download.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/pegozegi/blood_pressure_cuff_manual_amazon.pdfIn PDF document text
    • https://s3.amazonaws.com/pujinit/best_romantic_couple_wallpaper.pdfIn PDF document text
    • https://s3.amazonaws.com/mojivikapeti/sincerely_me_piano.pdfIn PDF document text
    • https://s3.amazonaws.com/fajonubinomeder/zameputamelarenupenexog.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00012f30.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12F30 23856 bytes
SHA-256: 1241f879b3c02a5c68a1c384a79aff18e1e4db4bbfdf0691a46c9b86ff35c7f7
font_00_sfnt_off0000f42e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42E 5404 bytes
SHA-256: 2ceb7b747ca01fb71b5474a505db90e065d8357356a6e3d930e9d23a7c127740
font_01_sfnt_off0001069e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069E 11824 bytes
SHA-256: e53788f9739598fe81992816881ba37c88d9deecc64e8f3bf5d06421ba4ae059

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