Malicious PDF — malware analysis report

Static analysis result for SHA-256 546053de1dc7f71e…

MALICIOUS

PDF

80.5 KB Created: 2021-02-19 00:25:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 8c924df1e5060f4b985990c69bf82473 SHA-1: e46409b06fac6d5d44699b1dfeba5060bc44d767 SHA-256: 546053de1dc7f71e6a52e92fa771a659ab336eb8fa05417e4ad7fa584b9e63bc
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malicious redirection attempt, likely leveraging a client-side exploit or social engineering.

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
  • 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://jacksth.ru/strik?utm_term=wheat+belly+diet+list PDF link annotation
    • https://nofuxufemi.weebly.com/uploads/1/3/2/6/132681390/rakekizuwa.pdfIn PDF document text
    • https://mujunoba.weebly.com/uploads/1/3/2/6/132682006/medarozurapeko.pdfIn PDF document text
    • https://zobegutibeg.weebly.com/uploads/1/3/4/9/134902349/0acc54.pdfIn PDF document text
    • https://gikovasedubum.weebly.com/uploads/1/3/4/5/134507074/zifinerevenezelimu.pdfIn PDF document text
    • https://vuwuzujos.weebly.com/uploads/1/3/2/7/132712237/5622328.pdfIn PDF document text
    • https://jitebogegamoma.weebly.com/uploads/1/3/4/7/134761197/27c7e2924ad8faf.pdfIn PDF document text
    • https://bobiputab.weebly.com/uploads/1/3/2/8/132814039/4884787.pdfIn PDF document text
    • http://samettemiz.xyz/best_offline_voice_assistant_app_for_androidlrye2.pdfIn PDF document text
    • https://jorevubo.weebly.com/uploads/1/3/4/8/134869484/5916646.pdfIn PDF document text
    • http://ketosimple.online/448476877745bojy.pdfIn PDF document text
    • http://vipmanmarket.space/55946169983sucwm.pdfIn PDF document text
    • http://kkkirrreeee.space/siwapopuwotediufacc.pdfIn PDF document text
    • https://jesisime.weebly.com/uploads/1/3/4/8/134886507/tokor_nuririgo.pdfIn PDF document text
    • https://tugofemupufere.weebly.com/uploads/1/3/4/5/134584107/3563635.pdfIn PDF document text
    • http://urolog.xyz/guxowafewermhjwd.pdfIn PDF document text
    • https://zemotererozo.weebly.com/uploads/1/3/0/7/130738962/1359462.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/kovozenamofox/68976466842.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41E 4644 bytes
SHA-256: b1f28542e730ebda828e0351a2fac9dbdc2a0f2a1281a92f5450975e43659182
font_01_sfnt_off000103f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F5 10276 bytes
SHA-256: 05a528fd1a096d5d87ce9ab0a109c0c58e050b44b79bb6e1c3706d39843f83bc
font_02_sfnt_off00012738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12738 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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