Malicious PDF — malware analysis report

Static analysis result for SHA-256 871c0b0d31c7255b…

MALICIOUS

PDF

84.9 KB Created: 2021-03-31 04:21:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 38b9b466ecb8f666ceecadda87fb7c04 SHA-1: 06acdf9e9d2e78ec0b6abeff808f54fbce91659d SHA-256: 871c0b0d31c7255b299bc5cbbf047300b628ef9ff6dcee87d37422eed6f3cbed
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 pointing to other PDF files hosted on various domains, many of which appear to be disposable or used for SEO link farming. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution through these linked documents. No scripts were extracted, but the structure suggests a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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/award?keyword=mapa+amsterdam+turismo+pdf PDF link annotation
    • http://itfamily.info/dusuxepubofabapeidozd.pdfIn PDF document text
    • http://shopeuro.pro/131633632446s9f5.pdfIn PDF document text
    • https://lumozumaxovoj.weebly.com/uploads/1/3/5/3/135348549/fapevozaburo.pdfIn PDF document text
    • https://rixedevo.weebly.com/uploads/1/3/5/3/135306589/7e0dc7405bc.pdfIn PDF document text
    • https://kifewaremavej.weebly.com/uploads/1/3/1/6/131606874/4c46f052e025f.pdfIn PDF document text
    • http://shopwithsale.website/devogaxidekotijuvh1mr.pdfIn PDF document text
    • http://vashobereg.com/2457710255hc9ra.pdfIn PDF document text
    • https://vezutokabev.weebly.com/uploads/1/3/4/7/134758566/vesidefeju_venosozewupalos_romilidimofubo_nekosaze.pdfIn PDF document text
    • https://majojolug.weebly.com/uploads/1/3/4/5/134595566/zujerojuxakabo.pdfIn PDF document text
    • http://1freedom.space/panasonic_plasma_tv_power_light_blinking_3_timesipkv9.pdfIn PDF document text
    • http://arbitestpark.xyz/80601299477lmo81.pdfIn PDF document text
    • https://xefulexemifin.weebly.com/uploads/1/3/1/3/131398452/resomeviju-nufotu-nozotuba-rabor.pdfIn PDF document text
    • http://mandarin-fruit.space/power_outage_report_duke_energyrmxtm.pdfIn PDF document text
    • http://raffle.website/zujakovewuz6f9x.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
    • https://uploads.strikinglycdn.com/files/1d0df7e6-b3d4-42ca-a49c-bedfb38f175e/best_way_to_learn_organic_chemistry_reactions.pdfIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/zununanafub.pdfIn PDF document text
    • https://s3.amazonaws.com/tozaduliwubega/88073287751.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9515daa-e224-47c9-b891-6e1996f74f95/what_is_agenda_21_list_its_principles.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/93668287271.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bf4da74-2b6e-49a5-a0ea-7d9c04fc990c/what_are_the_3_states_of_consciousness.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f52f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52F 4936 bytes
SHA-256: 088a79d3c8e7db01ba81200994740598a64dd527fb641ad1363677fa6de62c20
font_01_sfnt_off000105f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F5 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off00010e82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E82 13180 bytes
SHA-256: b90666c8d6e1c3511d237deade7a1f6627873e8b0ffdb2b1192dfd08443c07b3
font_03_sfnt_off00013696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13696 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3