Malicious PDF — malware analysis report

Static analysis result for SHA-256 04da56c3cd8926fb…

MALICIOUS

PDF

99.0 KB Created: 2021-03-17 15:28:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: dca0b699c8b8013f35f059e5ebc90fbb SHA-1: b111b5d1275775a68938e0d0291cff8d9a1d7305 SHA-256: 04da56c3cd8926fbd0e99bf50f8a0303f5d911bffeaa0237ab5c990802461b4e
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and flagged as part of a link farm. One critical heuristic indicates a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://crophysi.ru/strik?utm_term=mental+state+examination+definitions In PDF document text
    • http://tufuwavaziga.mygamesonline.org/nixon_watch_battery_tool.pdfIn PDF document text
    • http://wamijuw.22web.org/zitigozaribuliwakuxixujut.pdfIn PDF document text
    • https://jigaxokere.weebly.com/uploads/1/3/4/6/134622899/297f23cd2.pdfIn PDF document text
    • https://sefewazugep.weebly.com/uploads/1/3/5/2/135293251/114ed933beb5.pdfIn PDF document text
    • https://bugajikiwolano.weebly.com/uploads/1/3/4/4/134471946/312f125b519c.pdfIn PDF document text
    • https://jipenudus.weebly.com/uploads/1/3/1/4/131406532/f9a7a07dc302a.pdfIn PDF document text
    • http://kalidejomepajo.scienceontheweb.net/10_day_smoothie_challenge_recipes.pdfIn PDF document text
    • http://jesofazom.iblogger.org/82859411877.pdfIn PDF document text
    • https://sinekamawo.weebly.com/uploads/1/3/0/7/130776883/dikamuvusedew.pdfIn PDF document text
    • http://vugekowuzujed.scienceontheweb.net/project_manager_certified_salary.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6a7d747-2844-409a-bcda-ab8b349ebac4/vupizozu.pdfIn PDF document text
    • https://c7f0abc7-d23b-482d-bd16-0771495bb668.filesusr.com/ugd/bb13a2_1b20976620804a928a7b6d671dd6baff.pdf?index=trueIn PDF document text
    • http://jowosos.myartsonline.com/miwigisuboruzusogejejak.pdfIn PDF document text
    • https://c22e5cf4-338a-4003-9cad-c1cb0be29285.filesusr.com/ugd/3db607_a8b4f6b972cc4e58948469421e6979dd.pdf?index=trueIn PDF document text
    • https://245df057-3761-468b-8bc4-2c9c6734f7c7.filesusr.com/ugd/06c8e1_63560c0b987b4d0582ba1d72ff82de7d.pdf?index=trueIn PDF document text
    • https://5be7aec3-7d66-433b-ae1d-2bfb807ddf2a.filesusr.com/ugd/24deb6_179ef25f60fe4d4ebb2f6cc362ead457.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d6bdc03-67de-4785-a487-c1a28dfc0a2a/nomifulerijalidab.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_off000147d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147D3 5028 bytes
SHA-256: e1178d2f2e4f300c8eba504c588ff5be1971bda337b386c93894690e4a6e4f04
font_01_sfnt_off000158f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158F0 11660 bytes
SHA-256: b1ed6b862731d41ef3b5732dfee079fd12c8f8a2cce71c914a3693e08670119e

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