Malicious PDF — malware analysis report

Static analysis result for SHA-256 813c1ce29e8a01d3…

MALICIOUS

PDF

78.8 KB Created: 2021-02-27 19:45:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 2a42935ea58660d818a4cd797b866933 SHA-1: a11bc2687d8d808a1b38e34d0c71e03535f1626e SHA-256: 813c1ce29e8a01d3dbee897b51f50213ddf88d59ee71560b137724d505638662
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, with a primary external URI pointing to a suspicious domain that mimics a search result. Heuristics indicate this PDF is part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/award?keyword=who+is+the+killer+in+dark+season+3 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4496826/normal_5fe30f0f81221.pdfIn PDF document text
    • http://vaxisezawoged.scienceontheweb.net/supuwisoputedo.pdfIn PDF document text
    • https://cdn.sqhk.co/zivuzigup/ieuFjgj/real_cat_sounds_apk_download.pdfIn PDF document text
    • http://gevixadita.22web.org/messenger_mod_apk_naruto.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424400/normal_601eacced2a75.pdfIn PDF document text
    • http://zizodoroluxonaf.sportsontheweb.net/pizowulipejarijavojaze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408184/normal_602dc72fed5ed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373509/normal_5ffb70b38bb8d.pdfIn PDF document text
    • https://cdn.sqhk.co/najiligopej/yABhiHP/mlb_playoff_bracket_2019.pdfIn PDF document text
    • http://daating19.site/traxxas_rustler_4x4_vxl_owners_manualopoom.pdfIn PDF document text
    • http://zokidinodajives.getenjoyment.net/how_to_connect_anker_soundcore_liberty_air_2.pdfIn PDF document text
    • https://cdn.sqhk.co/pixefavenar/hdNS2ie/lobasurapavazego.pdfIn PDF document text
    • http://muzibatixabu.mypressonline.com/revitavagapiwituz.pdfIn PDF document text
    • http://ridunculus.com/zijava9ig4t.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://valupakukav.myartsonline.com/dd_wrt_router_ip.pdfIn PDF document text
    • http://nupifikitove.epizy.com/gepevupavoli.pdfIn PDF document text
    • http://kepofif.onlinewebshop.net/how_can_i_reduce_my_dish_network_bill.pdfIn PDF document text
    • http://jezevenakos.myartsonline.com/torewadefewamit.pdfIn PDF document text
    • http://gonoluripep.rf.gd/runazazu.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_off0000ec08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC08 4944 bytes
SHA-256: cf1c073b423457da90aab113c1edc104e0035e6addbc33cf1fbc0a2f5077477e
font_01_sfnt_off0000fcd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD0 10156 bytes
SHA-256: f182d7b714d79d7c45fdbce2184afd8c38c014c8b217a244c265fb19dcc47a8e
font_02_sfnt_off00011f93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F93 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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