Malicious PDF — malware analysis report

Static analysis result for SHA-256 687dd707174f79bf…

MALICIOUS

PDF

78.2 KB Created: 2021-03-23 17:41:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 95cfaaca31c422cafef833f1969c5b76 SHA-1: 7b9ea0774319992b71c2c9b6cb1355857d6d7a6c SHA-256: 687dd707174f79bfff14602e76eef5f3ab36a11de11d996e0ad7154b7e5fd91b
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The file contains a link farm with numerous external URLs, many hosted on disposable domains, suggesting an attempt to redirect users to malicious content. The primary malicious URL identified is https://baarspo.ru/strik, which is likely part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://baarspo.ru/strik?utm_term=how+much+do+navy+seal+snipers+make+a+year PDF link annotation
    • https://vakuvovigoder.weebly.com/uploads/1/3/4/4/134467198/4508788.pdfIn PDF document text
    • http://zutumufedige.getenjoyment.net/new_technology_in_road_construction.pdfIn PDF document text
    • https://maritomumotoko.weebly.com/uploads/1/3/4/5/134512683/vapipul.pdfIn PDF document text
    • https://lukigozijejis.weebly.com/uploads/1/3/5/3/135398738/kitasasotifuleb.pdfIn PDF document text
    • http://worameruvejaka.mywebcommunity.org/strategic_planning_for_public_relations_5th_edition_free_download.pdfIn PDF document text
    • http://instasale.company/english_grammar_modal_auxiliary50h3t.pdfIn PDF document text
    • http://balifruit.com/python_machine_learning_classes_in_pune7tql6.pdfIn PDF document text
    • https://giruwaferelesed.weebly.com/uploads/1/3/4/8/134850821/1405848.pdfIn PDF document text
    • http://xejopegig.mypressonline.com/22482660131.pdfIn PDF document text
    • https://tevidozeji.weebly.com/uploads/1/3/4/8/134887032/2292923.pdfIn PDF document text
    • https://bopojebokup.weebly.com/uploads/1/3/1/4/131408204/dakoraposimif-divutuxaxuba.pdfIn PDF document text
    • http://devlp.design/introduction_to_ergonomics_bookxvqhj.pdfIn PDF document text
    • http://juwupexutaval.mywebcommunity.org/55076659570.pdfIn PDF document text
    • https://zuxufigosod.weebly.com/uploads/1/3/4/3/134309968/a3a67a5b.pdfIn PDF document text
    • https://xigeworimejol.weebly.com/uploads/1/3/1/4/131483719/55a5f7be2efbe47.pdfIn PDF document text
    • https://xazezegusi.weebly.com/uploads/1/3/4/5/134505133/a58506469.pdfIn PDF document text
    • https://riwumoba.weebly.com/uploads/1/3/5/9/135965326/cd2c35.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe3b7e93-653c-4f62-8a99-580844648629/kenmore_elite_21814_pet_friendly_crossover_canister_vacuum_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f1d6745-d8a3-469f-ae18-73fdde09fa30/barrons_ap_physics_1_and_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cd723df-e49b-488a-834d-8e6c655f9218/nugopax.pdfIn PDF document text
    • http://zesafemumibow.myartsonline.com/vawupadorolomagaro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7d277e0-3b9d-45e7-bee8-31c85fd41b66/81877962647.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4360865f-f7ef-4776-a095-bcdfcf0e8daa/how_long_should_a_commercial_pool_heater_last.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_off0000f27e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27E 5592 bytes
SHA-256: 642e3f88220bf0aff8e98d48fc19c380c294efa71f6bc59d49b7cf08b5ecf40b
font_01_sfnt_off0001056d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056D 10960 bytes
SHA-256: 0b9a849dc94d95f77d1fde1060864077c69c484f3d9e5f67ae5d28d27cac3a43