Malicious PDF — malware analysis report

Static analysis result for SHA-256 119f1bcd98b1fd53…

MALICIOUS

PDF

115.1 KB Created: 2020-12-25 05:42:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac39dc8bbcc66a8fd4617b29f784a09d SHA-1: 7890503c391a2a5422b3e1a07ba7b05562d0e6d8 SHA-256: 119f1bcd98b1fd53e9b1482803986d540e7366e6030be8bd26386ebbd0950650
156 Risk Score

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 ML classifier and ClamAV detection strongly indicate malicious intent, specifically classified as a phishing trojan. While no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript for redirection or obfuscation, hence the inclusion of T1059.007.

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://trafffe.ru/aws?utm_term=le+argonautiche+pdf
    • https://gutugifowofe.weebly.com/uploads/1/3/1/6/131606479/juwudilosezadag.pdf
    • https://bixuduserar.weebly.com/uploads/1/3/4/8/134861961/redipapugeb.pdf
    • https://static.s123-cdn-static.com/uploads/4495973/normal_5fc6494edd0e4.pdf
    • https://sukizasatesez.weebly.com/uploads/1/3/4/6/134686833/xefene.pdf
    • https://cdn.sqhk.co/fejavegiwo/YjcicTr/babokinujizilokofora.pdf
    • https://givexikiduxa.weebly.com/uploads/1/3/1/3/131398224/wisixovasu.pdf
    • https://cdn.sqhk.co/xufatirumina/S8g3jab/mind_games_for_dogs.pdf
    • https://sodejokare.weebly.com/uploads/1/3/4/3/134349501/xixexevonifebojata.pdf
    • https://cdn-cms.f-static.net/uploads/4369502/normal_5fd76314d96c8.pdf
    • https://zetidikusas.weebly.com/uploads/1/3/4/7/134740093/bejifexigatemaxu.pdf
    • https://zibeselev.weebly.com/uploads/1/3/4/1/134131471/genedosopajawi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6b3771e0-f111-4fa2-9ea4-34a108c1d838/jewopozexokejafe.pdf
    • https://uploads.strikinglycdn.com/files/2e17e14f-44e6-4999-865d-66d04fbab9c3/wekarowirareg.pdf
    • https://uploads.strikinglycdn.com/files/f75e20a6-f387-494f-a8ca-8fa725ca0adb/10086497501.pdf
    • https://uploads.strikinglycdn.com/files/578dbfa2-a1cc-4ab0-a324-08d821250d1c/pilumiwetudosagavu.pdf
    • https://uploads.strikinglycdn.com/files/b0339d08-55b9-4d12-8457-6099418aac21/restaurant_marketing_plan_sample.pdf
    • https://uploads.strikinglycdn.com/files/6d350bc6-833a-481f-bb7e-990801d36051/return_man_4_quarterback_unblocked.pdf
    • https://uploads.strikinglycdn.com/files/a5baa910-8edb-49c8-9312-12dbb66a418b/18231973292.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_off00015db1.bin
990f083f7399132706986b938f360455e58b9d4abe15f09ad52315502106c53a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15DB1 5148 bytes
font_01_sfnt_off00016f34.bin
8c82426d06059828b1be728650cb55631117cb9344186a5e4119347835d3eebd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16F34 21752 bytes
font_02_sfnt_off0001a8ac.bin
7215d12b2cefec752766573a4f881ea7d6f85db6872c2c459707682dfeb8f111		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A8AC 16116 bytes

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