Malicious PDF — malware analysis report

Static analysis result for SHA-256 90ff07e31bc03aa0…

MALICIOUS

PDF

79.4 KB Created: 2020-11-22 03:27:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 89b5c22a4acdbddc88e7a3dc72bf0d84 SHA-1: 911a17510690d2bea0d5ee2b06573884110eb3a5 SHA-256: 90ff07e31bc03aa0cac59ae2b784ef5dbd82f58f2fcc743b926df701789639c0
274 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1553.005 Security Software Tampering

This PDF document exhibits multiple high-risk indicators, including a critical ClamAV detection and ML classification flagging it as malicious. It contains a link farm with numerous external URLs, one of which is `https://traffking.ru/123?utm_term=win+7+ultimate+loader`. The document also instructs the user to disable security software and presents a fake download button, suggesting an attempt to trick the user into downloading a malicious payload, potentially disguised as an archive requiring a password.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 9

  • 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.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffking.ru/123?utm_term=win+7+ultimate+loader PDF link annotation
    • https://musazowoxagaw.weebly.com/uploads/1/3/4/3/134323980/viwisetopatob-fimumapedugeb-xinobuzeboxuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366374/normal_5fad88847a415.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405895/normal_5fab9c1b6b854.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386830/normal_5fa2330db61c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451755/normal_5fafe717bf991.pdfIn PDF document text
    • https://rofotemajanati.weebly.com/uploads/1/3/4/4/134497193/803706.pdfIn PDF document text
    • https://goneludolazoga.weebly.com/uploads/1/3/4/4/134488647/d2ffb9e045.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369508/normal_5fb766bcb8e4f.pdfIn PDF document text
    • https://delutezebojuk.weebly.com/uploads/1/3/4/3/134353455/d15afea0b87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479236/normal_5fb4d2b5b4366.pdfIn PDF document text
    • https://relitemora.weebly.com/uploads/1/3/4/3/134352419/ae3bc8ce7d7f0.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/fovezewi/40475972876.pdfIn PDF document text
    • https://s3.amazonaws.com/juvosi/unlimited_google_drive_trick.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93075c64-8be9-417f-8ef2-dcb96b758c96/best_manual_sedans.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af6fc042-ca5d-4f4d-a8d2-4e86be8ac64a/busemovijugafor.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD432 4888 bytes
SHA-256: 14355e66ac21ab7094c6a39b33cbffccd3af69f1cc73ece56f09b7081f68810c
font_01_sfnt_off0000e4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C7 11140 bytes
SHA-256: 681d6c21a88944580d29b20f16410029ab085cd4d94b76f4908f30d6e4f80acd
font_02_sfnt_off00010aee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEE 21992 bytes
SHA-256: a70a4ef6d8964aa42a652e968505658a126a40b05378cb3ca43713e67a39c2c1

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