Malicious PDF — malware analysis report

Static analysis result for SHA-256 5efe991fd0afa0aa…

MALICIOUS

PDF

70.0 KB Created: 2020-11-18 09:20:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: daaae76622308b17d79156c25ae1f384 SHA-1: d30984dccddb4136d0a5183732c4d929a1fd33da SHA-256: 5efe991fd0afa0aa675ebfc42d970b9125074512fb7c4522f493d4450db1938d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files, which is indicative of a link farm or SEO spamming technique. One of the primary URLs, 'https://traffset.ru/123?utm_term=counting+by+7s+reading+level', is flagged as unknown but is part of a pattern often used to distribute malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=counting+by+7s+reading+level PDF link annotation
    • https://ranenowubugipo.weebly.com/uploads/1/3/4/0/134040983/xukupojugam.pdfIn PDF document text
    • https://gukaguse.weebly.com/uploads/1/3/1/3/131398473/c1b2c4c82eab99.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/40ddfa4d7f4e3e.pdfIn PDF document text
    • https://woxukobu.weebly.com/uploads/1/3/4/3/134392577/fetojiku.pdfIn PDF document text
    • https://wefolukozik.weebly.com/uploads/1/3/1/4/131406413/5859251.pdfIn PDF document text
    • https://tulejimukun.weebly.com/uploads/1/3/4/3/134399478/1918263.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/rubidokezive/adobe_audition_1._5_free_full_cracked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bb8b889-5110-49e0-b9c5-392c1c4e433b/baxidenigunobabexuxof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1829b778-25b1-441a-9724-2ef582058c48/98193989689.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/ctam_mark_award.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/87089940706.pdfIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/crossword_quiz_answers_celebrities_level_3.pdfIn PDF document text
    • https://s3.amazonaws.com/voxulija/gym_training_guide_in_hindi.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA69 5280 bytes
SHA-256: bf1a3c7b5364547daccf23167ef70172c1a206f505a673293b5ef6b72738bc67
font_01_sfnt_off0000dc70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC70 3720 bytes
SHA-256: a7c194c348f4bc26aad06ae1fa1eadf76503a3aca856ff80314c3d87a816eea9
font_02_sfnt_off0000e7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D0 10252 bytes
SHA-256: 4d49b10bef68120cb5128c37faf77c9c7838c18823c78f777e2862127103f240

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