Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0cbf54ff3bf0fa1…

MALICIOUS

PDF

70.3 KB Created: 2021-01-01 05:17:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: fef99379b8bd59e7047ef796cd827bae SHA-1: b4e48d495256ad0c79e78f1347b9ca20f372dd01 SHA-256: f0cbf54ff3bf0fa13427a9dd0b4f0350f52485a5722b4b6cb7cd7ff7c8c57155
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous external links, with one pointing to 'traffset.ru', suggesting a link farm or redirection to a malicious site. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and external link farm indicate an attempt to redirect the user to a potentially harmful resource, likely for malware distribution or phishing.

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=manual+de+homiletica+basica PDF link annotation
    • https://tatuxosigataban.weebly.com/uploads/1/3/4/7/134770737/38621411fd.pdfIn PDF document text
    • https://winakafefumo.weebly.com/uploads/1/3/1/3/131397983/kosifigenupux.pdfIn PDF document text
    • https://cdn.sqhk.co/nosuterib/uWhcVhb/miwefevixexixitekafibin.pdfIn PDF document text
    • https://cdn.sqhk.co/nupegefozub/hmgiP9M/menopasuxeju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366020/normal_5f9257e8110fb.pdfIn PDF document text
    • https://cdn.sqhk.co/vixokezafafu/cgdifig/87622957386.pdfIn PDF document text
    • https://cdn.sqhk.co/bibilofefi/NhgghsR/39122683599.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/retisovojor/sololearn_python.pdfIn PDF document text
    • https://s3.amazonaws.com/pafiganovavi/27431865141.pdfIn PDF document text
    • https://s3.amazonaws.com/tirimofufemukat/standardized_test_practice_answers_math.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/dynamic_stretching_for_runners.pdfIn PDF document text
    • https://s3.amazonaws.com/vonutavekip/fossil_wyvern_guide_osrs.pdfIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/singer_simple_sewing_machine_3116_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/atorvastatin_stroke_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/pokixovuxik/rational_numbers_class_7_ncert.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_off0000d455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD455 5228 bytes
SHA-256: e087ac1f9791399db15b6b22bd267421ef948e05e0036451b9fd27bfdabab483
font_01_sfnt_off0000e5ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FF 10676 bytes
SHA-256: f98d19f3a86c56ded251a35cdca238cea1c905df868f542a26cba7d0b57b439f

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