Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0ece26f257c104f…

MALICIOUS

PDF

74.8 KB Created: 2021-02-22 13:49:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4b8dad9274c1e0bcd366c68531964b0c SHA-1: 30deb25e3f7cd9891e43a5ca60db6310a8b64cb9 SHA-256: b0ece26f257c104ffa54374f91e4407d8be58d14c75a6e4e550ffc1f3bb4f08a
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with a primary suspicious URL being https://druttle.ru/123. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for multiple links, suggesting a campaign to distribute malicious content. Although no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggests it's designed to redirect users to malicious sites.

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://druttle.ru/123?utm_term=is+ncaa+football+coming+back+to+ps4 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4500889/normal_60236e2619ece.pdfIn PDF document text
    • https://xaroduzorosu.weebly.com/uploads/1/3/1/3/131398324/sutetibexavabi_lizebutezan_ralesugevipo_moweg.pdfIn PDF document text
    • https://xesuxikoju.weebly.com/uploads/1/3/4/0/134095833/262159bb6.pdfIn PDF document text
    • http://fruittea.space/round_table_talk_topicstl7w6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451220/normal_5ffbd0d57c730.pdfIn PDF document text
    • https://lodotimafigu.weebly.com/uploads/1/3/5/9/135981467/71d2ae92.pdfIn PDF document text
    • http://glossywp.online/descargar_libro_los_renglones_torcidos_de_diosa2jt1.pdfIn PDF document text
    • http://davufemalolaj.iblogger.org/bang_bang_video_song_in_1080p.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487197/normal_6000a2d697e62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446038/normal_601c03f389e9f.pdfIn PDF document text
    • http://itclick.info/fpsc_challan_form_2019_bps_165eybs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://jizuwugi.rf.gd/suverijiroxofivetowajox.pdfIn PDF document text
    • http://votemajaw.epizy.com/suzebiluga.pdfIn PDF document text
    • http://dogazuzi.epizy.com/mobomejuwapi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA73 5140 bytes
SHA-256: 569ff833fbe52d359de767da287a57129c44de54488161cdd40868aa8605a179
font_01_sfnt_off0000ebd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD1 10496 bytes
SHA-256: cb50e13a72ce21a21bb42a3b23c99d1df81dda99297ee78255d3000b8022b499
font_02_sfnt_off00010fea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEA 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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