Malicious PDF — malware analysis report

Static analysis result for SHA-256 e76231a51b1bca59…

MALICIOUS

PDF

73.4 KB Created: 2021-02-10 18:01:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 884883d68533f9a98fdb1249245a63fb SHA-1: 85c5cc8a1bbb6c8c1381dce4dc310a6e7356fbac SHA-256: e76231a51b1bca597974cda168a778cd5817321ef2feff3a87b8533d29afae16
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially harmful external sites, possibly for phishing or malware distribution, rather than providing legitimate content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://druttle.ru/123?utm_term=astro+kpop+desktop+wallpaper PDF link annotation
    • https://vosuzupitozom.weebly.com/uploads/1/3/5/3/135313705/nupar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456685/normal_601bfa5c46faf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480145/normal_5fd0585758db7.pdfIn PDF document text
    • https://nimaxosonoj.weebly.com/uploads/1/3/4/8/134897368/1767675.pdfIn PDF document text
    • https://tenosufude.weebly.com/uploads/1/3/1/4/131455069/wurume.pdfIn PDF document text
    • http://sarhello.online/90984153247yypxm.pdfIn PDF document text
    • https://nukivobiwej.weebly.com/uploads/1/3/4/0/134016752/465aeb9c4c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370529/normal_5fff23199990a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445532/normal_5fd91b889c76c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454547/normal_600ef59706fd0.pdfIn PDF document text
    • https://bojozavo.weebly.com/uploads/1/3/0/7/130740433/141c3781ef177a.pdfIn PDF document text
    • http://copyrightnotices-form.com/dnd_5e_gunslingerdulfv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C3 5160 bytes
SHA-256: 24561b8766c5fcc02af05f42185fffe5a8a3384865f291bfae76bd5cafde8b2b
font_01_sfnt_off0000e2d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D1 5100 bytes
SHA-256: 1819ff3d2b3ec9028140b9298c983c0c7f8bf49d19faa050fdc0b53771680442
font_02_sfnt_off0000f44f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44F 10772 bytes
SHA-256: 8f500c181cdd2d0603ead0e5127dab6ee63c224c331ebb4cf1b4717b7252e53f

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