Malicious PDF — malware analysis report

Static analysis result for SHA-256 8689c5ae4ffd1161…

MALICIOUS

PDF

92.8 KB Created: 2021-03-23 18:40:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f1bc68cac91b47f4bcf42e028d58cac1 SHA-1: 18825b095bd27e33bc1d4393124a94c4c583155f SHA-256: 8689c5ae4ffd116189a66065ff3be606115e448baaf790ea313e19e71919bdf4
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/strik?utm_term=night+angel+trilogy+reading+order PDF link annotation
    • http://muzibatixabu.mypressonline.com/energy_flow_in_ecosystem_ppt_class_9.pdfIn PDF document text
    • http://tejidirexe.mywebcommunity.org/important_national_and_international_days_and_dates.pdfIn PDF document text
    • http://kavelokafozi.medianewsonline.com/xokodin.pdfIn PDF document text
    • http://kalidejomepajo.scienceontheweb.net/math_kangaroo_2015_questions_and_answers.pdfIn PDF document text
    • http://lunatan.medianewsonline.com/42463994732.pdfIn PDF document text
    • http://wofefudolojet.mywebcommunity.org/biogeographic_realms.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lixuzo/34050541426.pdfIn PDF document text
    • https://61df3396-90b5-4b69-a3ae-475c9da6ebc5.filesusr.com/ugd/516574_0320d9a47ded4d7199ad89d3497d0116.pdf?index=trueIn PDF document text
    • https://b84c3727-5d5a-4c5d-9d5d-21cac87b3a69.filesusr.com/ugd/fdd6c2_3136c1baf4c8486e9a05267ff2e96709.pdf?index=trueIn PDF document text
    • https://c931c956-7f53-4e4e-96dc-27d7f003ba63.filesusr.com/ugd/b80c10_9347639fae7243fe8d7f2c28f200891b.pdf?index=trueIn PDF document text
    • http://zavalexudar.epizy.com/kipipesironuve.pdfIn PDF document text
    • https://a8a2d6b8-6248-42a0-90a4-e25e421c2e59.filesusr.com/ugd/f63f29_ba603729d3474eafa9e08cc284844f6d.pdf?index=trueIn PDF document text
    • https://68a74d12-89ac-4a94-b826-09ad332a30bf.filesusr.com/ugd/1a0392_2b74897791a040c6819d2bde9290a2ce.pdf?index=trueIn PDF document text
    • https://4cf2acc4-d143-4013-a78d-f21de0873c4f.filesusr.com/ugd/e4636f_b4de200020ff442fa51fe5a392746ee9.pdf?index=trueIn PDF document text
    • https://850a36a1-966c-46c3-86ed-e15bcb5778a7.filesusr.com/ugd/ede58b_9cfa5e22ffa145d2b64e253a976bbb5d.pdf?index=trueIn PDF document text
    • http://lawiferow.myartsonline.com/pidomuzijeduzalezamekeva.pdfIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/zomupokid.pdfIn PDF document text
    • https://bf130ee1-1463-4c69-9604-1b23772ced92.filesusr.com/ugd/b4609a_ecbddff08d2542f4896fd3078d2cd161.pdf?index=trueIn PDF document text
    • http://kesupipipiret.onlinewebshop.net/brother_vx-1120_bobbin_winder.pdfIn PDF document text
    • http://wuzazuj.rf.gd/trinomial_factoring_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/vukujidor/fishing_sim_world_beginner_guide.pdfIn PDF document text
    • http://wozimape.onlinewebshop.net/sufazetekeromemodo.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_off00012f8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F8A 4980 bytes
SHA-256: 583485292c6c33e80c407ed0b94b0474a814ab2dfdd25f55d3046e6ecfd6125e
font_01_sfnt_off00014081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14081 11044 bytes
SHA-256: 1890d4559aa8aa09cde4c297eaa39c2e6ac8f4f19a2ab3ea1c0908ce9577f072