Malicious PDF — malware analysis report

Static analysis result for SHA-256 21625e4de5187357…

MALICIOUS

PDF

78.4 KB Created: 2021-02-24 00:17:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 9c2b2d7da14d76104ae547cc205e9b22 SHA-1: df7932bc5b422241f6f5125c79052d4b43a32463 SHA-256: 21625e4de5187357ab3fd123e87572142e70476314c4e567a59bad1c53f3d666
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which are to benign-looking PDFs, suggesting a link farm or SEO manipulation tactic. One of the primary external links points to a URL that appears to be a lure for downloading drivers. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/123?utm_term=brother+hl-2240+driver+windows+7+32+bit PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4394073/normal_5ff0251b5ae01.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373779/normal_5feb68ed311ba.pdfIn PDF document text
    • http://unityfree.xyz/how_to_program_a_hunter_x_core_sprinkler_timerxuhuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455208/normal_6015e4884dde5.pdfIn PDF document text
    • http://ig-mediateam.net/english_grammar_in_use_extra_activities_apk3v8kb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369926/normal_5fd14fedf28d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388279/normal_601cde8a73214.pdfIn PDF document text
    • http://kedusigodozop.22web.org/vorumawelabur.pdfIn PDF document text
    • https://bosijoputa.weebly.com/uploads/1/3/4/3/134317673/xewir.pdfIn PDF document text
    • http://pafekusiwajida.66ghz.com/chris_martin_video_songs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409393/normal_5fca5970384c4.pdfIn PDF document text
    • http://padlamadla.site/net_speed_indicator_for_pcz7wei.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/xijuxosisomuna/fallout_4_covert_operations_percentage.pdfIn PDF document text
    • http://metukukerog.epizy.com/47591722442.pdfIn PDF document text
    • https://s3.amazonaws.com/bomifabipi/nexodavoko.pdfIn PDF document text
    • https://s3.amazonaws.com/tumuzu/91235662224.pdfIn PDF document text
    • https://s3.amazonaws.com/zalisujezajaje/vozilumoxigoda.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A1 5684 bytes
SHA-256: f24ca2060fa97fb0b7736fafac0754064e2ab3d472c1f86e745277c3db2d6871
font_01_sfnt_off00010419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10419 11292 bytes
SHA-256: 7b4c9c32a576fd954144eb3a64ac8ad9d2206db5cc71013796b68aeba59d4a0b

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