Malicious PDF — malware analysis report

Static analysis result for SHA-256 f34862c4136dce59…

MALICIOUS

PDF

75.6 KB Created: 2021-02-21 10:52:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 46e3ecca162910bd7911bf3c419e9f28 SHA-1: eafc850bc2224259d5c43e055f38775529386861 SHA-256: f34862c4136dce59d8028d2e5654a3112f1fc1f489a83fa50682781a6161b948
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external links, with one specifically pointing to `https://jottigo.ru/123?utm_term=easy+does+it+idiomatic+expression`, suggesting a phishing or credential harvesting attempt. The heuristic `PDF_SEO_DISPOSABLE_LINK_FARM` further supports this by identifying the PDF as a link farm on disposable hosting, likely designed to distribute malware or 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://jottigo.ru/123?utm_term=easy+does+it+idiomatic+expression
    • https://zakutawevuvukug.weebly.com/uploads/1/3/5/9/135970657/8153847.pdf
    • https://xolesozetenosox.weebly.com/uploads/1/3/1/0/131070434/jusokija.pdf
    • https://gevexivojuler.weebly.com/uploads/1/3/4/4/134444242/3980265.pdf
    • https://cdn-cms.f-static.net/uploads/4453328/normal_602b7bc5b6e16.pdf
    • https://cdn.sqhk.co/pakiwujipubi/hjfQQgi/ninja_blender_maker.pdf
    • https://cdn.sqhk.co/javeduner/ggejbRR/zatepanatog.pdf
    • https://dosupara.weebly.com/uploads/1/3/1/3/131380612/bowolaruda.pdf
    • http://lenorimageb.iblogger.org/bugafebi.pdf
    • https://bexaxaxaf.weebly.com/uploads/1/3/2/6/132682125/beduragaxo.pdf
    • http://ruzazeruduzelu.22web.org/51018832410.pdf
    • http://sexugaweguko.iblogger.org/bartender_automation_2019.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jikibepedoroto.epizy.com/56349437795.pdf
    • http://donafilozevore.rf.gd/haccp_risk_assessment_matrix_template.pdf
    • https://s3.amazonaws.com/kezemiradigu/lightroom_picture_editor_free.pdf
    • http://pomababotesu.rf.gd/angry_birds_epic_mod_apk_2._9.pdf
    • https://s3.amazonaws.com/xalexojaxipud/pomifosubofipigabaja.pdf
    • https://s3.amazonaws.com/xeropizuwe/fiddlesticks_beginner_guide.pdf
    • http://kujidexir.rf.gd/baldur_s_gate_enhanced_edition_apk_indir.pdf
    • http://wurozuvejesubot.epizy.com/business_visiting_cards_samples_free.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_off0000d38c.bin
e686cab2de86264432764595454dd7c82090c849954b63a97ce7a8591f670cb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD38C 5312 bytes
font_01_sfnt_off0000e599.bin
669d006131e005e5cc4510b145fe0cb60107d8c0858eb14869597be23d7e084e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE599 11260 bytes
font_02_sfnt_off00010c2d.bin
4b82b4e6758c9724109a395401e7d5f80da4354ccfd8329e94f99f69e5af3831		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2D 16120 bytes

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