Malicious PDF — malware analysis report

Static analysis result for SHA-256 11c3ead6d2df5c4c…

MALICIOUS

PDF

79.1 KB Created: 2021-04-07 12:39:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d593898ab0f7744e3f5036dd0c99c292 SHA-1: b28643b3c240416a99777e2b648f691973cffea8 SHA-256: 11c3ead6d2df5c4c2787e1960d4669778434122f0cecb1c83537b21d003bca62
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, indicative of a link farm or phishing operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://fokemale.ru/wix?keyword=memes+roman+empire PDF link annotation
    • https://cdn.sqhk.co/jotepomi/ZO9ja3k/pulebofizija.pdfIn PDF document text
    • https://cdn.sqhk.co/vitozogog/7Rsk6hc/tema_para_festa_infantil_masha_e_o_urso.pdfIn PDF document text
    • https://cdn.sqhk.co/pelopuxi/b7oYjfR/zixani.pdfIn PDF document text
    • http://tosefabebiribow.scienceontheweb.net/balerca_de_amontillado.pdfIn PDF document text
    • http://numberoone.xyz/bearded_dragon_names_for_boy_and_girl1o8pp.pdfIn PDF document text
    • http://kosonetibekub.medianewsonline.com/libro_cardiologia_guadalajara.pdfIn PDF document text
    • https://cdn.sqhk.co/kawonidoza/jjhgfcp/life_simulator_apps_mod_apk_2020.pdfIn PDF document text
    • http://danoguvokapijof.medianewsonline.com/87815637259.pdfIn PDF document text
    • http://usblighter24.site/78773916612qh5ag.pdfIn PDF document text
    • http://fivadoguna.medianewsonline.com/muxululorebodaruku.pdfIn PDF document text
    • http://thecabinets.xyz/1639503204483fsm.pdfIn PDF document text
    • http://miraluvofizobe.medianewsonline.com/ielts_speaking_part_2_3.pdfIn PDF document text
    • http://spain50off.info/how_to_connect_my_brother_printer_to_wireless_network3y7qf.pdfIn PDF document text
    • https://cdn.sqhk.co/tisojubew/iaHncdg/golf_course_hitting_range.pdfIn PDF document text
    • http://gixitetopes.scienceontheweb.net/bactrocera_oleae.pdfIn PDF document text
    • http://tokesuditetu.getenjoyment.net/9021694562.pdfIn PDF document text
    • http://xogunajeraxuda.mywebcommunity.org/bunker_hill_security_digital_safe_manual.pdfIn PDF document text
    • http://jubigale.scienceontheweb.net/10836298647.pdfIn PDF document text
    • http://gawudubigojan.getenjoyment.net/95519397383.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c6506652-bf5e-4f52-be36-03dbfaede22c.filesusr.com/ugd/f74919_f0396af2e84445d2905a51706d947a75.pdf?index=trueIn PDF document text
    • http://tapoloferazuziw.atwebpages.com/wakunexosoder.pdfIn PDF document text
    • https://68f2566a-c586-4d15-a5d1-3a72044c38f3.filesusr.com/ugd/ecec20_b76b2e4986c24ce297641ca809af1df2.pdf?index=trueIn PDF document text
    • http://romapubimowa.onlinewebshop.net/acuerdo_de_convivencia_escolar_secundaria.pdfIn PDF document text
    • https://827a6da4-a69c-4806-aaaa-db522494bc4d.filesusr.com/ugd/cb5916_e488f73ebf924822aeba63ed32fedcc3.pdf?index=trueIn 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_off0000f836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF836 4936 bytes
SHA-256: e60b4fd7eac899c940a3f0f974ef44fb6343ef8e8dbcd2c53c0ecdcf22fbd1a9
font_01_sfnt_off000108f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F2 10836 bytes
SHA-256: 8c293e73a2d3e55c68bad691ab084c7d64d11f20bb61d8e398c6a97ca0a20814