Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d47cdb475f95e00…

MALICIOUS

PDF

69.7 KB Created: 2021-04-02 22:22:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a6e483797e2d29f390062f010f22e53c SHA-1: ceba612af7e974fbe9eba8016496383ccd86c3c3 SHA-256: 0d47cdb475f95e0093e8e764a1106038faf53e279df6a6bfe5331210bc7ede74
126 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the use of embedded JavaScript for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=how+to+put+belt+on+bissell+powerforce+compact
    • https://cdn.sqhk.co/dedizajo/gjw7jft/1325310053.pdf
    • http://kavelokafozi.medianewsonline.com/cbse_class_10_english_question_paper_2020.pdf
    • https://cdn.sqhk.co/bonosexov/bUigq03/mozifusuw.pdf
    • http://fujigukatujewu.medianewsonline.com/68745725512.pdf
    • http://grigolia-studio.ru/rawuxiduzapadgdiae.pdf
    • http://sdfafq.info/what_is_the_most_common_job_in_colombiayiksq.pdf
    • http://obzorov.site/foxelizidanumukuvujovapelss517.pdf
    • http://nudivupekol.22web.org/16512006131.pdf
    • http://varnisvakq.ru/sozukofopamezorukoolcjl.pdf
    • http://felebom.iblogger.org/andromeda_apk_for_pie.pdf
    • https://cdn.sqhk.co/dukoredod/gjk46uG/91903988782.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://naluliwuv.epizy.com/88416131311.pdf
    • http://jabodegodonirad.atwebpages.com/ambito_social_eso_adultos.pdf
    • http://jenotuxeje.onlinewebshop.net/janepolab.pdf
    • http://kikodanaso.epizy.com/sinusite_chronique_traitement.pdf
    • http://dukerorute.epizy.com/shakespeare_sonnet_19.pdf
    • http://dikukezedigex.epizy.com/blogging_for_dummies_free.pdf
    • http://negavutagogo.epizy.com/007_blood_stone_pc_portugues.pdf
    • http://xodolipifonabo.epizy.com/99801116340.pdf
    • http://wotikuvejuf.rf.gd/pesemorolede.pdf
    • http://kozogasivufi.myartsonline.com/tekikemuvejizexo.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c782.bin
e20723e0e78a1531d1f85a566882c5f910f5e7e9c70a450bebacb0dc95f0abbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC782 5236 bytes
font_01_sfnt_off0000d93e.bin
c6862766fd1399dddf9b316d608d1121ad2452af68e6d788ebc787ebd7624a7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD93E 9812 bytes
font_02_sfnt_off0000facd.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFACD 4324 bytes

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