Malicious PDF — malware analysis report

Static analysis result for SHA-256 4df13a4ca469d21e…

MALICIOUS

PDF

82.2 KB Created: 2021-03-04 23:58:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 4a9f413a3edf312c62bf7cbc37abe8ef SHA-1: 922882fd7a72fe638f182bf0d7f7b1cd2879adfa SHA-256: 4df13a4ca469d21e5080be83e2e5e08c215de94b9e261a433c491e05be8d6a34
186 Risk Score

Malware Insights

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

The sample is a malicious PDF that contains a large number of external links, many hosted on disposable domains, indicative of a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs 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://botokaw.ru/award?keyword=toyota+camry+se+2018+tire+size PDF link annotation
    • https://zedodunojoponex.weebly.com/uploads/1/3/6/0/136083391/fitagogizizumo.pdfIn PDF document text
    • https://vawudida.weebly.com/uploads/1/3/4/8/134890241/145156.pdfIn PDF document text
    • https://cdn.sqhk.co/bisuligiga/jakjigf/voiceover_keyboard_mac.pdfIn PDF document text
    • http://fotulemeliluk.iblogger.org/rosuvevokonobesuxadi.pdfIn PDF document text
    • https://wunopavowar.weebly.com/uploads/1/3/4/6/134660490/8109875.pdfIn PDF document text
    • https://cdn.sqhk.co/nesuxozajek/hfMzhR5/marco_s_pizza_in_arizona.pdfIn PDF document text
    • https://cdn.sqhk.co/kevekelobivo/gjugiib/migusijasawe.pdfIn PDF document text
    • http://modutomipofa.iblogger.org/90942650193.pdfIn PDF document text
    • http://toselarasomax.iblogger.org/jurassic_park_the_game_ps4_trophy_guide.pdfIn PDF document text
    • http://likozibave.iblogger.org/giwelidizufi.pdfIn PDF document text
    • http://vugadabupujexax.22web.org/devexpress_report_designer_add_dataset.pdfIn PDF document text
    • http://sesopob.iblogger.org/sheets_for_ingenuity_bassinet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xilibosukotijob.epizy.com/80552912356.pdfIn PDF document text
    • https://9f9bd9fa-00fe-4673-b34e-9a629881f524.filesusr.com/ugd/09273f_cbe8d6a2ecf7496da5292b482bb90710.pdf?index=trueIn PDF document text
    • http://lepamiruketujuf.epizy.com/atelier_lydie_suelle_trait_guide.pdfIn PDF document text
    • https://ea74ff18-003d-4094-8454-8d7e15e33abb.filesusr.com/ugd/50de67_d875a06542fe4044b57925707be7b488.pdf?index=trueIn PDF document text
    • https://ac65beef-1c88-4b01-a948-251493ed82f2.filesusr.com/ugd/09857b_b52df599eecb4bba8f179267d2ff8050.pdf?index=trueIn PDF document text
    • https://436240a4-ef10-404e-ad90-c5cab949c7af.filesusr.com/ugd/3fb742_e847f5edae614f41a5080e6503ad7c16.pdf?index=trueIn PDF document text
    • https://f05e0dbb-21cf-40ea-8b71-00b8d6f49a3b.filesusr.com/ugd/b09e1d_5b4099ebd45a4c45b3e40384ea4cd056.pdf?index=trueIn PDF document text
    • https://c1d61d78-9bae-425c-b347-ee91470fe4f1.filesusr.com/ugd/60933b_9167487217e6499594768ce555ee5ee4.pdf?index=trueIn PDF document text
    • https://73e25548-3913-4bbb-aa69-a1b25f69568d.filesusr.com/ugd/cece23_ee6e0e62fb3041e7b3a469416d449c35.pdf?index=trueIn PDF document text
    • http://velirogajebabe.epizy.com/28508481367.pdfIn PDF document text
    • https://1347de4c-4e54-429a-b84c-372e60bc5a2b.filesusr.com/ugd/6c98bc_842716854d9f4783a726657f0a29d858.pdf?index=trueIn PDF document text
    • http://xasexaxalu.epizy.com/wuperobulowejesewawilatuz.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10530 5532 bytes
SHA-256: e795756f3d4ba6a9c451605a1f6bbd33c535ae764cbe92ef5ea9a79a62a145da
font_01_sfnt_off000117f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F5 10428 bytes
SHA-256: 8a226933293c29171190a43b66c80afd5588ef7500690886423d613570849e3e