Malicious PDF — malware analysis report

Static analysis result for SHA-256 bff565e4d7dffb8c…

MALICIOUS

PDF

122.1 KB Created: 2021-05-13 13:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da67643366f5d633e3a007fc6233c9f9 SHA-1: ac239abf465de95c363226942dbf6a53aebb7afa SHA-256: bff565e4d7dffb8c9a3b2219ca2c3e6f77f57ffdeab6bc496cfae1851d13b3ad
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body, though partially corrupted, contains references to 'wkhtmltopdf' and a date, hinting at its generation method and potential use as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://dugedepap.ru/strik?utm_term=how+to+use+sketchup+layout+2018
    • https://buzomuzugagi.weebly.com/uploads/1/3/4/3/134313884/7edabef.pdf
    • https://gadogirunen.weebly.com/uploads/1/3/5/3/135347667/wagubosuwe-dudubikiwap-ligunezeka-dumopemorejer.pdf
    • http://winoxolupuvil.getenjoyment.net/free_diablo_2_classic_cd_keys.txt.pdf
    • https://wisukasef.weebly.com/uploads/1/3/1/4/131453855/2d44c45f1f.pdf
    • http://fuvagezilavez.mygamesonline.org/biosense_webster_product_catalog.pdf
    • http://esagafow.fun/folopufakomutusbagm5.pdf
    • http://tafuxasomup.getenjoyment.net/mecanica_vectorial_para_ingenieros_estatica_9_edicion_solucionario_cap_4.pdf
    • http://zinefikitozozeg.sportsontheweb.net/9285786285.pdf
    • http://bluebadgeform.com/bujawaworafv00t2.pdf
    • https://topepixifugop.weebly.com/uploads/1/3/4/3/134322533/d1e622cec.pdf
    • https://pupinalakarer.weebly.com/uploads/1/3/4/2/134234580/jobavosezunivo-lasaga-zusufefiwajoji.pdf
    • http://vashobereg.com/mackie_control_protocol_specificationr3f5c.pdf
    • http://itgermany.net/53091242041el24o.pdf
    • http://lnstagramverifiedbadge-media.com/nefovigasewi7ytgw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tokavasetalan.epizy.com/capitec_learnership_application_form.pdf
    • https://uploads.strikinglycdn.com/files/0ff391be-5622-4aba-bb29-f6531d68062d/nirajasu.pdf
    • https://uploads.strikinglycdn.com/files/8e8dd482-bd36-4302-9a0b-956da380a72e/who_is_god_ks2.pdf
    • http://tasefabomodewiv.epizy.com/tewuvejefabemewefediwa.pdf
    • http://badizep.epizy.com/foloritufurisowokinukaleb.pdf
    • http://dipumekamerara.rf.gd/the_black_bible_of_science_review.pdf
    • https://uploads.strikinglycdn.com/files/a0682ebb-883e-4e18-93fb-5fdbeddc63af/97211239824.pdf
    • https://uploads.strikinglycdn.com/files/5ea4ee52-6e75-4ff6-8f78-4781ea9583cd/viredatuvojozu.pdf
    • https://uploads.strikinglycdn.com/files/ab169ce4-f8de-42e9-a4fd-4ac65a5ea309/dogifone.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_off00018ada.bin
a69c3f33c000de6a876a1054c2fc5a6a1a042c7a4207b45f19b445c836f63dd1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18ADA 5872 bytes
font_01_sfnt_off00019e8e.bin
cb44409d1176d812503677d3737f2ac0d8c161574b1363871b56c468c3875b71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19E8E 5664 bytes
font_02_sfnt_off0001b1f4.bin
2f8c11f59c7022f0f1288e00042e742db5e72be9e9c2f8f3dbd5ed6cf7f21f6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B1F4 11796 bytes

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