Malicious PDF — malware analysis report

Static analysis result for SHA-256 696915d9d05f43fd…

MALICIOUS

PDF

76.3 KB Created: 2021-03-28 12:08:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0edd96c32de8562e71e3ed27c5500489 SHA-1: d748105dd702aee68c2281935561f8fc659ee36c SHA-256: 696915d9d05f43fd4917c433e74c1db6ae8f3a26e95a01d289f7cc6233d4d091
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed for SEO manipulation, aiming to direct users to potentially malicious websites. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification further supports its malicious nature. The document body, though heavily obfuscated, contains text related to firmware updates, suggesting a lure for users to download or access compromised content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://druttle.ru/wix?keyword=holiday+chest+freezer+drain+plug
    • https://gajegebukorivip.weebly.com/uploads/1/3/4/4/134487765/87c825792.pdf
    • https://cdn-cms.f-static.net/uploads/4489041/normal_6027687415c9b.pdf
    • https://nokesopupikes.weebly.com/uploads/1/3/4/7/134767934/kudexobuxox_xutukavubobe.pdf
    • http://naturfresh.fun/best_civ_6_seedsy066u.pdf
    • https://cdn.sqhk.co/wutalididow/UcURogf/54801139115.pdf
    • http://stylecurtains.com/articulate_storyline_tutorials36a24.pdf
    • https://mikuloxituxawe.weebly.com/uploads/1/3/1/4/131410747/b2c3e51.pdf
    • http://gufutaca5.xyz/bopalajnp8w.pdf
    • https://dofewomal.weebly.com/uploads/1/3/4/5/134510420/8761571.pdf
    • https://vusokozederik.weebly.com/uploads/1/3/4/9/134901716/3196499.pdf
    • https://femixazate.weebly.com/uploads/1/3/4/3/134363246/nefiroxupodigimu.pdf
    • https://cdn.sqhk.co/pemejurove/mhhyYhj/69482844832.pdf
    • http://eurosett.net/jasoxuma7ihos.pdf
    • https://jetujonupukoj.weebly.com/uploads/1/3/1/1/131163664/9035492.pdf
    • https://cdn-cms.f-static.net/uploads/4481157/normal_605f6a5162202.pdf
    • https://cdn-cms.f-static.net/uploads/4368246/normal_5fdb68720d78c.pdf
    • https://bunivuwavimi.weebly.com/uploads/1/3/4/7/134706582/5948198.pdf
    • https://mixidesurujof.weebly.com/uploads/1/3/4/9/134902607/nuxotupijozetuporag.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8f2585f8-f7c9-4059-8870-ae01e12f7df8/cisco_sg200-50p_firmware.pdf
    • https://uploads.strikinglycdn.com/files/60d57135-4c83-4dce-a00a-77d6fd9526b2/58819559420.pdf
    • https://uploads.strikinglycdn.com/files/e4e72ecd-023e-48fa-ac7a-9d197a14e889/how_much_to_replace_oven_igniter.pdf
    • https://uploads.strikinglycdn.com/files/b71bfcaf-4192-4e68-8755-a00763107d06/70494042131.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaef.bin
9ddbd112b004ec921056a897fe9eede75dcdd4d348abe79f60e9bc42a7fc1327		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEF 5532 bytes
font_01_sfnt_off0000fdcb.bin
851c68c0f40281da9c82d379e8dafeab4a6821858cabacfc69bd319d46111d3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCB 10520 bytes

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