Malicious PDF — malware analysis report

Static analysis result for SHA-256 c89c104c38b7f47b…

MALICIOUS

PDF

87.5 KB Created: 2021-02-21 15:17:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: c6d08390a3369fa231383afa1aab1aeb SHA-1: 896799529d67f51c723895e8d9d9fdf912012470 SHA-256: c89c104c38b7f47b7c7b3f71e9b2fe033198dd7a0b7066f599106c949eb07f5f
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, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier further indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the presence of numerous external URLs points to an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://maypoin.ru/123?utm_term=can+britax+b+safe+be+used+without+base PDF link annotation
    • https://cdn.sqhk.co/dutararopat/jbid9hi/50264862036.pdfIn PDF document text
    • https://cdn.sqhk.co/bubiwalifeda/bUgjjac/votexedepejog.pdfIn PDF document text
    • https://cdn.sqhk.co/suwezuzifu/zYhciie/jomenus.pdfIn PDF document text
    • https://tazanuna.weebly.com/uploads/1/3/5/9/135977230/dufikusewivav.pdfIn PDF document text
    • https://cdn.sqhk.co/surofowudula/dfhfvYA/popular_hashtags_on_instagram_to_get_likes.pdfIn PDF document text
    • https://cdn.sqhk.co/sononipo/RGPAnav/gizufapaxapujuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410702/normal_5fd13ee0043ae.pdfIn PDF document text
    • https://cdn.sqhk.co/gawagunikuw/FhfjcAK/33103075526.pdfIn PDF document text
    • https://cdn.sqhk.co/madilaxetevo/cgfjhPP/simple_cake_designs_for_baby_girl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466413/normal_5fdea00148431.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://rupevisa.epizy.com/colin_thackery_final_performance_bgt.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f57c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57C 5168 bytes
SHA-256: f97b83aad60ba5e6daa92eda90c58f21580f5338fd9e95f623e2972c60078b86
font_01_sfnt_off0001071c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071C 10732 bytes
SHA-256: eda10b4a051f5ff3f5c66d34200a33ee07700be6d10077b6a6d7f8a01368d9c4
font_02_sfnt_off00012bff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BFF 16076 bytes
SHA-256: b12fd7abebef46c6af06114fd52e3a226bf6873093cd64b6bfea0858fd0ebc42
font_03_sfnt_off000140a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140A2 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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