Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccc506bb7fe153bc…

MALICIOUS

PDF

75.8 KB Created: 2021-04-28 05:29:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 194e82047bd59538ac4dfcd024cffb3b SHA-1: 646d37955af3a2b638ad3bc45b41169400d617e2 SHA-256: ccc506bb7fe153bca17a05578d969eb28bae34965f2a8993b5fd996787b18593
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs that redirect to a suspicious domain, identified by heuristics as a link farm on disposable hosting. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The document body, though heavily obfuscated, appears to be a lure related to earbuds, intended to mask the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jottigo.ru/strik?utm_term=jlab+go+air+true+wireless+earbuds+how+to+turn+on PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4499300/normal_6007b918941e0.pdfIn PDF document text
    • https://cdn.sqhk.co/posogamumut/jdhbhc7/85995423377.pdfIn PDF document text
    • https://cdn.sqhk.co/gabebutiz/qhbugcf/ctech_elm327_bluetooth_obd2_car_diagnostic_interface_tool.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368248/normal_5fd958d744266.pdfIn PDF document text
    • http://vetovikaxu.mypressonline.com/how_to_start_an_aa_meeting_on_zoom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457279/normal_60262c63ce78f.pdfIn PDF document text
    • http://tujidal.mypressonline.com/pezagirasozalumozudojanev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464715/normal_6030898073d85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449793/normal_6068cf9e8a912.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5789fe8a-9b89-4d73-88a5-6d5fd2f9f7ca/kabonisaxigupakenu.pdfIn PDF document text
    • http://xutenujute.myartsonline.com/93006215773.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae28162d-217d-4e5c-93b0-ae63d8a87a27/14087609242.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/810f8433-cdec-4168-820e-20f960ee28b3/2002_buick_century_heater_hose.pdfIn PDF document text
    • https://c18d7360-3707-4bf1-9d6f-52ba7510fa17.filesusr.com/ugd/76cb06_9221b2c1b9b04e90a3302c73dbeee3ec.pdf?index=trueIn PDF document text
    • http://duwemanuwixam.atwebpages.com/80091453943.pdfIn PDF document text
    • https://9fbaa0db-fe9e-443e-b503-3d02ea494c21.filesusr.com/ugd/d417e9_e34cec959c8e4d95803a9ed77fd5f7e9.pdf?index=trueIn PDF document text
    • https://a16eeaf1-ab09-4fb7-bdbc-3ebfa24c279d.filesusr.com/ugd/03042f_7f9272e709de4828ab335fc94b46a1e0.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE808 5308 bytes
SHA-256: d8e69fbd698ba569200519e68a26c4b360c7bad6c92d0e210c24d8106014e791
font_01_sfnt_off0000fa1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1B 11252 bytes
SHA-256: cc933d2a828531a463f1ab204811db3db9ca379f70dc7ce3f026d57f29abcc87

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