Malicious PDF — malware analysis report

Static analysis result for SHA-256 2670bcb852b671a0…

MALICIOUS

PDF

81.6 KB Created: 2020-12-18 23:44:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 0dd9abd25a2a2a9b6da273262518e95e SHA-1: 6f6de8d2250a5b9cf990f17c57ddaf2782f93086 SHA-256: 2670bcb852b671a0f29ac0550357f10199a4e60d7cf5c521f85a95ff65e2f40f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, flagged as a link farm for SEO purposes. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially harmful websites.

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://traffset.ru/aws?utm_term=anti+narcotics+force+uniform PDF link annotation
    • https://kumupesefutevun.weebly.com/uploads/1/3/4/4/134463509/dakasin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468871/normal_5fd2ef2084816.pdfIn PDF document text
    • https://pakedarisibibo.weebly.com/uploads/1/3/4/5/134501134/xejerade-dolisadoweke.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/d306245c-7edf-4b8a-a57b-aef6df7f6bb2/82864526161.pdfIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/email_meeting_notes_template.pdfIn PDF document text
    • https://s3.amazonaws.com/rurosaveruk/suzefilufefaxu.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/date_fns_formatdistance.pdfIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/nijixexujenomewajasananam.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5720fc6229360eccb86af/t/5fd734a4226e9048fad16568/1607939237915/60992415530.pdfIn PDF document text
    • https://s3.amazonaws.com/kofabube/44419420050.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DF 4984 bytes
SHA-256: 4797cbb2c8afac89760ba3e453efa2a33d9924e97d27f863f7ee8468abafb859
font_01_sfnt_off0000f9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BE 10948 bytes
SHA-256: 978c455d95413203c4eadfdefd2467697b7ddea63b3e6b56f7e3d369b7643446
font_02_sfnt_off00011f46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F46 17728 bytes
SHA-256: 77467017fdea6c15c2b9521b323e3740d5fb3fb01b8f348525fbee1345347cb9

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