Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4496e40d67e5d9d…

MALICIOUS

PDF

123.4 KB Created: 2021-01-02 11:55:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 6c9627f491bdc91d9fff242b1db295ef SHA-1: 7001ef4c66c1a06cb6c0241dcc9858fb21cd1556 SHA-256: f4496e40d67e5d9d9681c925975d24d574d57be3335b267f7924d1b1bf854cff
244 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which point to other PDF files hosted on disposable domains or redirectors. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that at least one URL leads to known malicious infrastructure. The ML classifier and ClamAV also flagged this file as malicious, suggesting it is part of a phishing or SEO manipulation scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://gettraff.ru/aws?utm_term=molecular+population+genetics+and+evolution+pdf In PDF document text
    • https://fawawivog.weebly.com/uploads/1/3/4/5/134595284/256501.pdfIn PDF document text
    • https://bunemevomuw.weebly.com/uploads/1/3/4/7/134733911/5153312.pdfIn PDF document text
    • https://ganokupojedozo.weebly.com/uploads/1/3/4/8/134890080/f724e1cf.pdfIn PDF document text
    • https://sadakijawezawu.weebly.com/uploads/1/3/4/5/134595959/885e8fa26053041.pdfIn PDF document text
    • https://laxuruvu.weebly.com/uploads/1/3/1/4/131482832/munavuzuzufofopifi.pdfIn PDF document text
    • https://kunulidozejenu.weebly.com/uploads/1/3/3/9/133997834/tugedebix_joroj_kogibofeniruj_zuwomi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418762/normal_5f9800fc3fd23.pdfIn PDF document text
    • https://xetamoro.weebly.com/uploads/1/3/2/8/132815737/71a116e50e6f6.pdfIn PDF document text
    • https://zafigitelerom.weebly.com/uploads/1/3/4/3/134338481/jenaxodebivatip_femikamuwijes_tumesup.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/muvarelo/tinkers_crossbow_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bufipevuril/44259224907.pdfIn PDF document text
    • https://s3.amazonaws.com/derefe/manila_mart_beltsville.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_off0001a595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A595 5388 bytes
SHA-256: 933c09715b359fa0f301cdac2c79cc2ad72e240c8d5a2a10d840696d51169734
font_01_sfnt_off0001b80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B80E 12164 bytes
SHA-256: 8e1c0e2504f72b35d94ec429a5ace7244aa8eda971aeaa2ec73d1ba79fa8c2dc

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