Malicious PDF — malware analysis report

Static analysis result for SHA-256 c24cc30f74993ff6…

MALICIOUS

PDF

74.8 KB Created: 2021-03-25 03:08:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 90a22363e9ba50f3ad60dd2fd46e6477 SHA-1: 51f823fa4093a4b6a9f09954c011753698221afe SHA-256: c24cc30f74993ff603fb58b4753f367bf2604605efa43a0ca21ee162e16d6a21
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier, indicating it is likely a phishing or spam document. The presence of a large number of external links, including one pointing to 'druttle.ru', suggests an attempt to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs strongly indicate a malicious intent to lure users to external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/wix?keyword=kim+young+chul+north+korea
    • https://static.s123-cdn-static.com/uploads/4385648/normal_5ff393f14f6c7.pdf
    • https://cdn-cms.f-static.net/uploads/4497395/normal_5feaf0bd80ea8.pdf
    • https://pexagujunivati.weebly.com/uploads/1/3/4/6/134684520/kibojoba-zunodugukalisif.pdf
    • https://cdn-cms.f-static.net/uploads/4447270/normal_6027fcfc1021a.pdf
    • https://tekigeja.weebly.com/uploads/1/3/1/3/131384442/1d835.pdf
    • https://wafiludelo.weebly.com/uploads/1/3/1/4/131437380/fekoligemoz_navijavarukebe_tavexenuwowis_lawabiguf.pdf
    • http://ctuxuu.com/entrepreneurship_books_downloadsd0k9.pdf
    • http://rezltml.xyz/731238651219v49o.pdf
    • https://vepodiruwa.weebly.com/uploads/1/3/4/3/134374194/161691.pdf
    • http://ketotreno.buzz/30611242485y72pi.pdf
    • https://cdn-cms.f-static.net/uploads/4420756/normal_5fda1fdf8ff4c.pdf
    • https://static.s123-cdn-static.com/uploads/4413457/normal_5fec9b1c58758.pdf
    • http://mebel-albero.ru/4897109631061dg7.pdf
    • http://cashbackk.site/netgear_n600_c3700v2h1e5s.pdf
    • http://deine-gabe.com/evicore_guidelines_cignat5urc.pdf
    • http://loveworld.club/character_creator_app_for_androidjkmcd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://21319658-e817-4d6a-846f-872ccfe0f0c2.filesusr.com/ugd/982af2_fbfa042ccab74a77979136a7c31de257.pdf?index=true
    • https://5a1138df-423b-4a5d-a7c7-36223740754e.filesusr.com/ugd/a72fa8_da22a9d1c4eb48a1a27c8372926207ff.pdf?index=true
    • https://737c154f-ca75-4484-807d-9d5c19d76377.filesusr.com/ugd/7e84b7_9514a051104c479c988f8f872e09070e.pdf?index=true
    • https://9170d309-caca-4186-8987-bf6b40ce219c.filesusr.com/ugd/baef12_63123b85bd9b488294cccc2eb6f5c4ab.pdf?index=true
    • https://945b3f91-9c76-4178-be32-f0dab3cfe2c6.filesusr.com/ugd/8d5d69_7b85615e09da4c588a8780bcc9c94474.pdf?index=true
    • 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_off0000e775.bin
9f8780d03b84e9671a67a2977034400ed66ef25e8eb4cb0651a2f6b7e164acb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE775 5168 bytes
font_01_sfnt_off0000f8f2.bin
318ffb461f68ff7ab529d633f15491c7ae6cd6753f5e87cc3ea4fa823876abc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F2 10908 bytes

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