Malicious PDF — malware analysis report

Static analysis result for SHA-256 11c4cf9710cb0b32…

MALICIOUS

PDF

80.5 KB Created: 2021-02-26 01:16:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 115d960b2413b79bef14f7dc757b87b8 SHA-1: c354d4977046d178426f0978724e2e01f2801acf SHA-256: 11c4cf9710cb0b32bba9a00a52373d59101901c58a20d1c8bfa3780c271b5258
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains a large number of external links to various domains, suggesting a link farm or redirection mechanism. The presence of 'Pdf.Phishing.Trojan' in the ClamAV detection name points towards a phishing or trojan distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/aws?utm_term=diablo+3+skill+build+demon+hunter PDF link annotation
    • http://zikewexer.scienceontheweb.net/fulimodefejaz.pdfIn PDF document text
    • https://piladokad.weebly.com/uploads/1/3/4/7/134759874/6846109.pdfIn PDF document text
    • http://rodsfish.club/4277439924241w3f.pdfIn PDF document text
    • http://reduslimitalia-ufficiale.site/10708069687v3s97.pdfIn PDF document text
    • https://xonasuxodu.weebly.com/uploads/1/3/2/6/132681295/375d89ad73.pdfIn PDF document text
    • http://discovljzg.fun/how_to_use_bionaire_humidifierhlwbh.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/fajixe/brazil_food_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/georgia_learners_permit_study_guide_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/figugipopar/7588312776.pdfIn PDF document text
    • https://s3.amazonaws.com/dosipive/jackson_hole_snow_report_history.pdfIn PDF document text
    • https://s3.amazonaws.com/vanatul/11806079520.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_off0000fc66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC66 5432 bytes
SHA-256: c2141c999ea3b32eae95286a5fc2bf9dfab655a545951053ae67e2d15f460a89
font_01_sfnt_off00010eb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB6 11856 bytes
SHA-256: 3ed387cdedb9dab06a5433a1f54433744269466cf9b9bc1525a74730f630923a

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