Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d490efa6a2a7c8e…

MALICIOUS

PDF

74.4 KB Created: 2020-11-25 05:00:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6b83ff4dc49ff27e5807c60ddf39162 SHA-1: 1904bd7efc4460d68304d3f52cec3883241bd8e6 SHA-256: 9d490efa6a2a7c8e61ea21403b149989164e10e306ad62ad628018078eb6c70a
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one identified as a malicious redirector. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and the presence of many external links suggest a link farm or phishing attempt. The ML classifier and ClamAV detection further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ggtraff.ru/strik?utm_term=k+rino+torrent
    • https://cdn-cms.f-static.net/uploads/4409093/normal_5f9fe0a31466f.pdf
    • https://xizogezoki.weebly.com/uploads/1/3/4/7/134717510/2437720.pdf
    • https://cdn-cms.f-static.net/uploads/4367296/normal_5fad3211155aa.pdf
    • https://cdn-cms.f-static.net/uploads/4366343/normal_5f881282a44c5.pdf
    • https://cdn-cms.f-static.net/uploads/4489035/normal_5fb383ceb41b2.pdf
    • https://cdn-cms.f-static.net/uploads/4367919/normal_5fa663d6e6ada.pdf
    • https://cdn-cms.f-static.net/uploads/4368227/normal_5fb7acc30151e.pdf
    • https://cdn-cms.f-static.net/uploads/4377379/normal_5fb8f4633df15.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d8817289-7735-495c-b1d8-eaa11e63204b/29124336455.pdf
    • https://uploads.strikinglycdn.com/files/90db607d-ba83-4bb8-8a4a-8ab08e199cb3/skyrim_whiterun_house_location.pdf
    • https://s3.amazonaws.com/xakusineba/gasivofugowoxagewuva.pdf
    • https://uploads.strikinglycdn.com/files/8368d75a-bd19-4a9a-b130-310e7a48d0e6/lg_oled_pixel_refresher.pdf
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c46d.bin
9eb47328953fa2176e9f102035852eaee958ff5613b6777be5df8bdf0f08014e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC46D 4228 bytes
font_01_sfnt_off0000d2d7.bin
e9f629e265b5bb7738a859aa645de7e5d1f45de99aafe58242bce5cdcb743ed1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D7 17876 bytes
font_02_sfnt_off00010872.bin
9c43c18aa358de8105755ede142c657c2a330b0e24b8f62e03bdb628bd5289a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10872 16088 bytes

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