Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc7fdbb75f43d63e…

MALICIOUS

PDF

90.7 KB Created: 2020-12-22 17:44:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 5e2a036f52c6a93eeb7c9511b0500b64 SHA-1: d1c7f496654f2780f18cec1f51cb18bb87c88a06 SHA-256: bc7fdbb75f43d63ef02ccafa1c5e4da90dde7154b44022e38afdbbe04a9b7c24
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm for SEO purposes. One of the primary URLs, 'https://trafffi.ru/123?utm_term=facts+about+legalism+in+ancient+china', is flagged as unknown reputation, suggesting a potential malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://trafffi.ru/123?utm_term=facts+about+legalism+in+ancient+china PDF link annotation
    • https://xuvarilanagore.weebly.com/uploads/1/3/4/4/134470983/e9335.pdfIn PDF document text
    • https://jiwamotezonadiw.weebly.com/uploads/1/3/4/3/134325797/973f4f9a893e93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380859/normal_5faa023277081.pdfIn PDF document text
    • https://wetewiduwolenit.weebly.com/uploads/1/3/4/5/134599830/a28810552fe41.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc2263a0-684c-431c-ad94-55e7a07f0271/los_liones_trail.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75c1d254-0d09-46e5-9fc2-73f66bd9730a/tamufanemala.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f5bd11f6a4198485fb86/t/5fc611fb61e25426e107cc81/1606816253724/diguzubob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03815e8e-8a6b-4913-8664-821ce0b81da8/his_dark_materials_discover_your_daemon_quiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d176da18-00da-405b-835b-b01faa1d52b2/fawirumijili.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc51130ea4a794d565ff698/t/5fcbb0d47ab0f364abb2021b/1607184596651/property_brothers_home_design_game_mod.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_off00012712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12712 5212 bytes
SHA-256: 7c387d5c9d3391724f494ea1d642fd05e99f67e2eb6ee4c323994ef88e30c2b8
font_01_sfnt_off000138ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138AC 11056 bytes
SHA-256: b7e238d44e7f60470b78a052a0a9adf894d07852ae196d5c1338caad4f50d593

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