Malicious PDF — malware analysis report

Static analysis result for SHA-256 010a86c277aca599…

MALICIOUS

PDF

70.6 KB Created: 2021-02-03 01:40:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: fe1714b902e36688d10b589044cd373d SHA-1: f71539d1ade7cce2ebdc04797fcc8e0611ea39a8 SHA-256: 010a86c277aca5992543dfd6a7c0202ad25c73e4098150ced35ed7e6f6b782f2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF that contains numerous embedded URLs, many of which point to suspicious or disposable domains. Heuristics indicate it's a link farm designed to redirect users, and a machine learning classifier and ClamAV both flagged it as malicious. The presence of embedded URLs suggests an attempt to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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/aws?utm_term=janapada+audio+songs+come PDF link annotation
    • http://reflectionss.space/notukgk0to.pdfIn PDF document text
    • http://niwawopomovaz.22web.org/arquivo_de_licena_avast_premier_2019.pdfIn PDF document text
    • http://reduslim-italiaoficial.site/tolavupasosufipnh7v4.pdfIn PDF document text
    • http://coolstudent.space/battle_royale_fps_shooter_offlineg0wxo.pdfIn PDF document text
    • http://proflist-briansk.ru/head_ball_2_game_videopsvxh.pdfIn PDF document text
    • http://betixisu.22web.org/51756411956.pdfIn PDF document text
    • http://spoonnumberone.xyz/free_icons_without_attributione424c.pdfIn PDF document text
    • https://labomozojaxige.weebly.com/uploads/1/3/0/7/130738499/2046d1933802fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485946/normal_5fd3816b6d851.pdfIn PDF document text
    • https://foxevavudutis.weebly.com/uploads/1/3/4/3/134380199/wonunapo.pdfIn PDF document text
    • http://my-favshopf.online/98242325372p7os1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417527/normal_6006d2fa6fe82.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xupasafagimi.rf.gd/weight_gain_smoothies.pdfIn PDF document text
    • http://muxuzuvom.epizy.com/ninezo.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_off0000d5ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5ED 5252 bytes
SHA-256: ecd515ac58e3275a01280a070b23a75ea450f405c5c23f52c0122c55374befb5
font_01_sfnt_off0000e7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C3 11536 bytes
SHA-256: fabe9baae4737b7ae75afd7c373143b9b45c36a83eacfd1d1426198f63739d1e

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