Malicious PDF — malware analysis report

Static analysis result for SHA-256 c83e621ccf3ad22e…

MALICIOUS

PDF

74.0 KB Created: 2020-12-31 14:00:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: c7fdaa515fd3f5618e29713cc1c87b76 SHA-1: 0505ded7afc6561788c53921bee9e57fbc1726b2 SHA-256: c83e621ccf3ad22e371dc4ae4e5126f2b1271ca998fde319f205959b97f0367d
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 by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the nature of the heuristics point towards a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafficel.ru/123?utm_term=kenmore+elite+vacuum+user+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4404757/normal_5fe5445f0e3a2.pdfIn PDF document text
    • https://cdn.sqhk.co/lilapanorup/hdf8GqX/dictionary_python_append.pdfIn PDF document text
    • https://mixunolonuwoja.weebly.com/uploads/1/3/0/9/130969204/woxodu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383922/normal_5f97c264640f2.pdfIn PDF document text
    • https://nelemiken.weebly.com/uploads/1/3/4/7/134704654/1243517.pdfIn PDF document text
    • https://midomiwu.weebly.com/uploads/1/3/4/5/134592630/lopulejaxejokib.pdfIn PDF document text
    • https://cdn.sqhk.co/dimumaneda/hijihba/idle_war_tank_tycoon_mod_apk.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/ef8e9fb5-5a29-4e6b-9f61-5ffb3e396962/48214304848.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6656e72c-1963-44de-a2f9-ecdac4227b2a/34542920992.pdfIn PDF document text
    • https://s3.amazonaws.com/pozokimepe/biosensors_journal.pdfIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/99988269750.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/course_syllabus_template_latex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55a6c201-6fdf-4185-8fcc-0512b74ab0bb/10955649987.pdfIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/depths_of_time_2_afk_arena_guide.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_off0000e5da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DA 4972 bytes
SHA-256: fa53306cad93dee49849f06f971595abcb049ccdea4502384228646b7b75da02
font_01_sfnt_off0000f6b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B3 10768 bytes
SHA-256: b16706395dbe5ee72d54112244b32e200e3597ae3cd2428ffffcec9b6cf17efb

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