Malicious PDF — malware analysis report

Static analysis result for SHA-256 15c091bee419a050…

MALICIOUS

PDF

86.4 KB Created: 2021-04-07 21:17:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6eeab94f67e0d4a306253de39449e28 SHA-1: 761efba5f726f6baf3716a89255bfed5da94ac45 SHA-256: 15c091bee419a0504d82f331dc6e16c0111272e7c6802f58eb7a6688e3a2513f
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/strik?utm_term=the+edge+of+never+documentary
    • https://fasukawoj.weebly.com/uploads/1/3/1/4/131453618/wawekoji.pdf
    • https://xanuzejo.weebly.com/uploads/1/3/1/6/131637194/kufewomi.pdf
    • http://bebolekuku.22web.org/jubesun.pdf
    • https://sapakuso.weebly.com/uploads/1/3/5/2/135297556/9005253.pdf
    • https://dupevolorimix.weebly.com/uploads/1/3/4/5/134588768/338273b0be02d.pdf
    • https://tunivarururi.weebly.com/uploads/1/3/4/0/134041149/zisizaxumenuma-fezelebamijef-vivewetobuz-wedowugolit.pdf
    • https://static.s123-cdn-static.com/uploads/4416494/normal_5ff5b78329320.pdf
    • http://rusaleti.22web.org/bhagavad_gita_in_gujarati_free_download.pdf
    • https://cdn-cms.f-static.net/uploads/4403674/normal_6050ea23ebe08.pdf
    • https://wisevagidigo.weebly.com/uploads/1/3/0/7/130740356/vonivififinonavofuxo.pdf
    • https://static.s123-cdn-static.com/uploads/4371786/normal_5ff6588be1672.pdf
    • http://kujudunoberij.22web.org/honda_em5000s_generator.pdf
    • https://static.s123-cdn-static.com/uploads/4369329/normal_6003190d486fc.pdf
    • https://cdn-cms.f-static.net/uploads/4496014/normal_6028b8881b952.pdf
    • https://cdn-cms.f-static.net/uploads/4489058/normal_600b639bad6ce.pdf
    • https://static.s123-cdn-static.com/uploads/4422637/normal_5fdece59a358e.pdf
    • https://cdn-cms.f-static.net/uploads/4472213/normal_60177c568544c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gonidiwofove.epizy.com/pharmaceutical_quality_assurance_and_quality_control.pdf
    • http://vapasiwivomod.epizy.com/nunizuritekaz.pdf
    • http://rudezil.rf.gd/scientific_classification_of_banana.pdf
    • http://puwevaladimeve.epizy.com/kolitis_ulseratif.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011345.bin
df329f1913c2e1760b50fdecc5ec5ffba3e44561a1a1596fc97527b01ef30269		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11345 5336 bytes
font_01_sfnt_off00012554.bin
3efe5586dbe81ed7979b495ff9806441bbf3f6b622939f71f53a06cf4e74779f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12554 11356 bytes

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