Malicious PDF — malware analysis report

Static analysis result for SHA-256 e49a052cf14d8518…

MALICIOUS

PDF

74.3 KB Created: 2020-12-18 20:57:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 93be205acb41560b4702042765e80626 SHA-1: 8368abf47904d63d367af0b779753df278f2ef3a SHA-256: e49a052cf14d8518673e48aed87b47e77cef40b1e176af5c0e8d96fc101cb7a2
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. The PDF contains a large number of external links, many pointing to potentially malicious or SEO-farmed content, suggesting an attempt to redirect users to harmful websites. The document body, though heavily obfuscated, appears to contain keywords related to calculators and educational topics, likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafftec.ru/strik?utm_term=fourier+transform+calculator+emath
    • https://cdn-cms.f-static.net/uploads/4418762/normal_5fbe692a765db.pdf
    • https://zesopupejilit.weebly.com/uploads/1/3/0/7/130738861/8085188.pdf
    • https://pixasowurixes.weebly.com/uploads/1/3/4/9/134904492/8388347.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/68556f37-64e8-4c9c-b49f-0908fd34671d/1895610194.pdf
    • https://s3.amazonaws.com/pezofut/cannibal_2019_movie.pdf
    • https://uploads.strikinglycdn.com/files/fe24f215-b9d7-434d-bc55-30eb30ea82ef/potsdam_elementary_school_staff_directory.pdf
    • https://uploads.strikinglycdn.com/files/856d2504-efa0-4a51-a286-59495e03c477/tri_tronics_classic_70_charger.pdf
    • https://uploads.strikinglycdn.com/files/43d1e61c-3367-4688-beb8-ebe267f34a02/tagew.pdf
    • https://static1.squarespace.com/static/5fc294b8ea4a794d564fdff1/t/5fc732bca3696915e220754b/1606890172996/viledebidijezufelidi.pdf
    • https://uploads.strikinglycdn.com/files/4d45c59b-4fb4-4c03-8801-89b89a9a7503/minnie_mouse_templates_to_print.pdf
    • https://uploads.strikinglycdn.com/files/1eca9fa7-2630-459a-9d63-f83174a05054/nori_presto_renton.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dea9.bin
5f8143fa1500a5cfbe39ff17e109fc532c12068b27ddf5fff4df4b3671e9f52c
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA9 5076 bytes
font_01_sfnt_off0000efbd.bin
9697f3cd6c7e02458a103762fa1942408e34fd83acb3422b780e2fc36f18662d
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBD 12636 bytes