Malicious PDF — malware analysis report

Static analysis result for SHA-256 be1e9912b20ef265…

MALICIOUS

PDF

85.3 KB Created: 2021-03-24 18:11:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26a86ba5d9b6265aaeec63bcd99cd657 SHA-1: 70b545c86c2ddd1dc33abeb43aeebcee3cab71df SHA-256: be1e9912b20ef265edc4367c8058742939d2abd5d750e3fd3c1818e072129785
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with critical heuristics indicating it functions as a PDF link farm. The primary malicious URL, https://resalured.ru/award?keyword=eccentrically+loaded+foundations+pdf, is embedded within the document, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent, likely related to spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/award?keyword=eccentrically+loaded+foundations+pdf
    • https://static.s123-cdn-static.com/uploads/4500444/normal_5fcbd1d2b83b1.pdf
    • https://cdn-cms.f-static.net/uploads/4494661/normal_602ab2215a075.pdf
    • https://static.s123-cdn-static.com/uploads/4403118/normal_6008bf3af2e86.pdf
    • https://cdn-cms.f-static.net/uploads/4378175/normal_604f0b04ed6c9.pdf
    • https://cdn-cms.f-static.net/uploads/4404122/normal_604679f592332.pdf
    • https://tafanoxuxirugo.weebly.com/uploads/1/3/5/3/135327873/6967555.pdf
    • https://cdn-cms.f-static.net/uploads/4394066/normal_603ea90f5ef46.pdf
    • https://static.s123-cdn-static.com/uploads/4407318/normal_600917717fba5.pdf
    • https://static.s123-cdn-static.com/uploads/4413718/normal_5ffe728f0a803.pdf
    • https://ludebopukum.weebly.com/uploads/1/3/1/3/131380916/burupuzesi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/f62b44cc-5db2-4df7-884c-bcaab08798e3/drz400sm_service_schedule.pdf
    • https://s3.amazonaws.com/savifin/popozelixopuze.pdf
    • https://s3.amazonaws.com/tamobalasu/toshiba_dvd_player_support.pdf
    • https://s3.amazonaws.com/tokatefozude/lilubemafixat.pdf
    • https://s3.amazonaws.com/lumixi/wow_battle_for_azeroth_soundtrack.pdf
    • https://s3.amazonaws.com/filidabut/bawovipodufup.pdf
    • https://uploads.strikinglycdn.com/files/d10adb68-311a-4fb1-9505-86ac942b10b0/texatejuvim.pdf
    • https://s3.amazonaws.com/nabifovu/37391576956.pdf
    • https://s3.amazonaws.com/xirixepo/cerebral_cavernous_malformations_icd_10.pdf
    • https://uploads.strikinglycdn.com/files/ed10eb3d-453f-43eb-bcf9-6283eb00bcea/92570073653.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102b8.bin
5755e41ed047274f9ce03147919ce9e90cb6ebe57d1c9891ee8189678a77d714		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102B8 5092 bytes
font_01_sfnt_off00011410.bin
eb506937022facf2ce7a5f57e12cf6f5dc3eb83f8691d416ccd9f69f2db863a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11410 10424 bytes
font_02_sfnt_off000137f4.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x137F4 4324 bytes

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