Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d72b14a4d3e1ea1…

MALICIOUS

PDF

112.9 KB Created: 2021-04-02 00:01:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0691a13558e74f4715220b3a1e3383c7 SHA-1: b421845c9b310b0cf1aedb005a2406243d57294a SHA-256: 8d72b14a4d3e1ea17dd7f99b2a578209e48b21e0023e6a35c949be45c8cfc0df
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though obfuscated, appears to be a lure related to a technical issue, directing users to a suspicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/strik?utm_term=what+do+you+do+when+your+chromebook+screen+goes+black
    • http://all-system7.xyz/antikvariniai_kapirovskio_dantys_mazule6twv1.pdf
    • http://jakufodunod.getenjoyment.net/37234340836.pdf
    • https://cdn-cms.f-static.net/uploads/4426953/normal_600a67f5611f3.pdf
    • http://detonic-ufficiale.website/1050286931qw2j8.pdf
    • https://cdn-cms.f-static.net/uploads/4426677/normal_604fbf655fc27.pdf
    • https://cdn-cms.f-static.net/uploads/4421462/normal_603b1b96b53e9.pdf
    • https://cdn-cms.f-static.net/uploads/4489402/normal_601b64b520951.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/fb651654-43fe-42e9-830a-9c8090ce57d2/fibagorupigidofa.pdf
    • https://uploads.strikinglycdn.com/files/3b6c11fa-df76-4f7c-a25d-0aa0918e81cc/jufagomaviv.pdf
    • http://pixafur.atwebpages.com/vogexovokepepewujebegobo.pdf
    • https://ab60d57a-1f92-408f-9079-0b325776b613.filesusr.com/ugd/724fb5_010d0a5c78594b9e90b433d99f7678f4.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b37c7dde-4e73-4fac-b9a8-30a7febfb7f9/69655824096.pdf
    • https://183df7f2-4185-4ca0-bfcc-33b39bc842f1.filesusr.com/ugd/9ac34a_ae353f2ff0474b42ab8ec0ed89331663.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1ae57465-5c6b-42ed-8e63-f95ee530bb19/41210412192.pdf
    • https://uploads.strikinglycdn.com/files/f1da175a-60b9-41c6-928b-d83fcdc88714/6021311723.pdf
    • http://tagijonegularol.myartsonline.com/the_cabin_in_the_woods_the_official_movie_novelization.pdf
    • https://9526c93a-d340-4dca-b5fd-2864ff0888c4.filesusr.com/ugd/4c3d6a_909906c2e15d4f7da07f33eea210bef1.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_off00017b2f.bin
3ce69bcd76c5b0749d10823e7c07d71e95299dc6f271f4629e8063d3c61a6658		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17B2F 5764 bytes
font_01_sfnt_off00018ec1.bin
81819cbb9abbcfa50c5eff5312a88f743279c14b4648f1651cbedf95966d448a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18EC1 11584 bytes

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