Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8133650a9d60ac3…

MALICIOUS

PDF

77.8 KB Created: 2021-05-28 22:15:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e02baeb175292e2cb88dcf809076f873 SHA-1: ae9042d30a20e3ddcc26fdeb38ef41b289981132 SHA-256: f8133650a9d60ac331802333f9dde0212c298ca77ab9f055acb42b748ccdda94
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The PDF contains a large number of embedded external links, indicating a link farm or phishing attempt. While no scripts were explicitly extracted, the presence of numerous external URLs suggests the document is designed to redirect users to potentially harmful sites.

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://soxebez.ru/123?utm_term=bellissima+script+pro+font+free
    • https://cdn-cms.f-static.net/uploads/4459478/normal_6014f8ca6eeae.pdf
    • https://cdn-cms.f-static.net/uploads/4468267/normal_600c1a2e9c380.pdf
    • https://static.s123-cdn-static.com/uploads/4388613/normal_5ffb45d36752e.pdf
    • https://jonukejunuxesa.weebly.com/uploads/1/3/1/4/131409236/tapoxipa.pdf
    • https://static.s123-cdn-static.com/uploads/4457604/normal_60080a9cec5e9.pdf
    • https://static.s123-cdn-static.com/uploads/4407057/normal_5fed6a42eac5e.pdf
    • https://cdn-cms.f-static.net/uploads/4458856/normal_5fd39050390d0.pdf
    • https://cdn-cms.f-static.net/uploads/4467318/normal_603c2a316a115.pdf
    • https://sozobuxetezubu.weebly.com/uploads/1/3/4/5/134527793/makanubarubezuxi.pdf
    • https://sifumoxijobobo.weebly.com/uploads/1/3/4/4/134493963/c3b2b1a63d0.pdf
    • https://zosojelukik.weebly.com/uploads/1/3/1/8/131871698/verudav.pdf
    • https://liwitozawaben.weebly.com/uploads/1/3/4/0/134042828/sojugak.pdf
    • https://cdn-cms.f-static.net/uploads/4366011/normal_6026c0d23b4c2.pdf
    • https://static.s123-cdn-static.com/uploads/4382793/normal_5ff06a42c9311.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5b533248-fb35-4771-bbcf-d372995960a3/55654040033.pdf
    • https://uploads.strikinglycdn.com/files/d7c3c792-9dcb-41c0-8f14-5bf3170f12e8/10651992230.pdf
    • https://uploads.strikinglycdn.com/files/6113fe47-58e4-4bb6-8b2e-620c31763046/55375109981.pdf
    • https://uploads.strikinglycdn.com/files/4991bf4b-eb5b-4ec6-a2e8-8b730ffc440b/lofegiza.pdf
    • https://uploads.strikinglycdn.com/files/55da70e9-586b-4640-8284-c388d01e0e7f/suluxadimalimuvakipiwu.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_off0000d5c3.bin
bcd3d52fa2b013cbffac678c430f345826eba845d8895fe41db28e205ff9dc8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C3 5212 bytes
font_01_sfnt_off0000e765.bin
46fa7007b05dd3ee0ed89fbf332996aafc561adcce4f567e31cadbeb62a689dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE765 12880 bytes
font_02_sfnt_off000112f3.bin
e5245523bd71a78e06ca3300da63f55ad096e28dd8c1a5e83e138be64f7d0aee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112F3 16084 bytes

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