Malicious PDF — malware analysis report

Static analysis result for SHA-256 01d0a85e3dc180be…

MALICIOUS

PDF

67.8 KB Created: 2020-11-11 05:14:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c52fd09dc3eadd0cd85f8a6444466a3d SHA-1: 7455d534a377e92a1859b230e8c10e408a92f978 SHA-256: 01d0a85e3dc180be66358e7fea4c756c6db96273b8181d9fe14d4f508fb43256
176 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one pointing to a URL that appears to be part of a link farm. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting a tactic to manipulate search engine results or host malicious content. The 'SE_CALLBACK_LURE' heuristic also suggests a phishing or scam pretext, though the document body is heavily obfuscated and does not provide clear textual lures. The presence of embedded URLs and the overall structure point towards a malicious document, likely used for phishing or as part of a larger malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://trafficel.ru/strik?keyword=abiotic+vs+biotic+worksheet+answer+key
    • https://cdn-cms.f-static.net/uploads/4365626/normal_5f8724087fd52.pdf
    • https://rivatuvimib.weebly.com/uploads/1/3/4/4/134469475/70816.pdf
    • https://pevomoten.weebly.com/uploads/1/3/4/6/134626000/e5878e744.pdf
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/rotizizalipi-xulejowo-wegevok-xutijub.pdf
    • https://cdn-cms.f-static.net/uploads/4371258/normal_5f968faf8f0de.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nilafafakem/jogapem.pdf
    • https://s3.amazonaws.com/jimugivos/dynamic_figure_drawing_david_finch.pdf
    • https://s3.amazonaws.com/jikopot/59321332770.pdf
    • https://s3.amazonaws.com/sefipa/92242187315.pdf
    • https://s3.amazonaws.com/dudigonifu/the_story_of_stuff_video_worksheet_answer_key.pdf
    • https://s3.amazonaws.com/jitimesolagun/showbox_apk_4.27.pdf
    • https://s3.amazonaws.com/subud/553_bus_schedule_nj_transit.pdf
    • https://s3.amazonaws.com/lakadutof/37148084576.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_off0000c9cd.bin
10ef3f74c05fc0ce347925d7e781325749f9f64b152ebfe7dc749adf4485bc38		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9CD 5304 bytes
font_01_sfnt_off0000dbf1.bin
de62b07411c72c52cab49276e6256bfaa4034f5b6d06c9e147596b62be92161d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF1 11568 bytes

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