Malicious PDF — malware analysis report

Static analysis result for SHA-256 260e34a895220d18…

MALICIOUS

PDF

68.3 KB Created: 2021-03-24 21:48:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a97ee81e2e0f2bcff13ead545abd25cb SHA-1: b273d424ed783cbd75569a7c411cb95c2916419d SHA-256: 260e34a895220d185fd58c35b6f3cef1c939f05967a76ca748145985c0ed1b91
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or SEO spam. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

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://lozipotod.ru/strik?utm_term=g+shock+ga100-1a4 PDF link annotation
    • https://radifepibonavu.weebly.com/uploads/1/3/2/7/132712096/4689891.pdfIn PDF document text
    • https://nilukosezaxed.weebly.com/uploads/1/3/0/8/130814529/suxoninavi-danog-neroda.pdfIn PDF document text
    • https://lotopunukulel.weebly.com/uploads/1/3/4/4/134473418/307984.pdfIn PDF document text
    • http://vuletotam.scienceontheweb.net/1098122436.pdfIn PDF document text
    • http://segupatotujipiv.iblogger.org/leriraxamedikiv.pdfIn PDF document text
    • http://kevareso.iblogger.org/fases_del_aprendizaje_basado_en_proyectos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kibejulega.epizy.com/proficy_machine_edition_9.5_software_download.pdfIn PDF document text
    • http://xujided.onlinewebshop.net/the_things_they_carried_quotes_about_kiowas_death.pdfIn PDF document text
    • https://s3.amazonaws.com/kiremefegonar/gubuferajaxasitodo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eaf2abee-bf0a-4d74-b807-f542d1d2c785/dekelovomivopavexi.pdfIn PDF document text
    • http://pidosowot.epizy.com/close_corporations_act_69_of_1984.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e8de0e8-609b-4585-9714-63e45ca18429/origins_of_totalitarianism_sparknotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ce0fda9-4b7e-4ae9-9930-c4232b9fcd7a/stihl_weed_eater_string_replacement_fs38.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3175d871-b888-4703-a92c-ebed9b7c16f8/21847574127.pdfIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/siberinaje.pdfIn PDF document text
    • http://nesaroxex.rf.gd/jumujapebamiza.pdfIn PDF document text
    • https://s3.amazonaws.com/patilawasu/6459621212.pdfIn PDF document text
    • https://s3.amazonaws.com/wutezigojuxi/mamabininoliviwizuzuwix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/538b047e-3853-449b-aa81-be759342107c/children_story_books_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea2cf708-27e4-4f38-a8ec-f558da782848/wetusakegizet.pdfIn PDF document text
    • https://s3.amazonaws.com/pokixovuxik/77096369887.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53a70d85-1882-4aea-a1ef-c4e8cb81022e/how_to_use_verizon_wifi_hotspot.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_off0000cd52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD52 5344 bytes
SHA-256: 3983e462f3f8147cbea597fd5e6f89300f2a4f8979bb0b9bba8b7be16874e30e
font_01_sfnt_off0000df95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF95 10520 bytes
SHA-256: d489da240078108e6a414678200cbf7fab491129b9e0d102b351b9f270ad87d5