Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b8f8c9d676d9361…

MALICIOUS

PDF

75.7 KB Created: 2021-02-28 23:05:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 26307dc3a715f1a8a6d2c5a37440bd95 SHA-1: 97e67d14a436dc8c1ea7a44a93f478a2f455f9b2 SHA-256: 9b8f8c9d676d9361223c0f13ed6b6c125815b05555bcefc06dac414696a4dbe6
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one prominent URL suggesting a lure related to reading a graphic novel online. The presence of numerous links on disposable hosting and the ML classifier's high confidence score indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://soxebez.ru/strik?utm_term=read+twilight+graphic+novel+volume+2+online+free PDF link annotation
    • http://regsenatvumen.website/kaufland_jarocin_gazetkaldred.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368731/normal_6030e44527f22.pdfIn PDF document text
    • http://hurleyshamburgers.com/38551108879ojr3o.pdfIn PDF document text
    • http://mpvideo.org/ceqa_guidelines_section_15064._5oprec.pdfIn PDF document text
    • http://tertov.xyz/87863656932eo5tj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443824/normal_5fe54576e9f24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458854/normal_60274d08d816a.pdfIn PDF document text
    • http://taforojujutusig.mygamesonline.org/super_mario_land_dx_cartridge.pdfIn PDF document text
    • http://20970907.net/recorder_app_ios_freegtmbr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xizevobawilu.epizy.com/kewadisarebota.pdfIn PDF document text
    • http://sukokovevaz.atwebpages.com/behringer_xenyx_q502usb_driver_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/83954758350.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/88696849456.pdfIn 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_off0000e863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE863 5680 bytes
SHA-256: 2707d27702b7b9ddf08edd8d7a783f16df9e190dccb3e1c3954c307712fb3900
font_01_sfnt_off0000fbb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB3 11064 bytes
SHA-256: d15862ad206d50b7d6422449a9cfd09b4627be440603dd5edd3521a35354a21c

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