Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc286e86256e6a05…

MALICIOUS

PDF

80.7 KB Created: 2021-03-29 20:29:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d5f3e00a3a171a3a43bca89d67d7167d SHA-1: 6ead4dbb897bb2eb78f31409edcb12d2081b858b SHA-256: fc286e86256e6a05cf9d280cd61606809fc572e8444b4898cd0d402667c3432e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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 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=antimicrobial+activity+definition+pdf PDF link annotation
    • https://cdn.sqhk.co/zosiwutu/yjatgeA/warzone_download_time.pdfIn PDF document text
    • http://midosiw.22web.org/61184522307.pdfIn PDF document text
    • https://cdn.sqhk.co/sivunukiwe/dx1IieF/81941121355.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527237/normal_6059bd3bc890f.pdfIn PDF document text
    • http://mabisipi.iblogger.org/95222593817.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393644/normal_6055323a6eddf.pdfIn PDF document text
    • http://filitopalanima.22web.org/naomis_room_book_review.pdfIn PDF document text
    • https://cdn.sqhk.co/rozesivotix/dQuIgh5/warhammer_quest_2_review_pc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471464/normal_5fd7459c36765.pdfIn PDF document text
    • https://cdn.sqhk.co/xaveredero/gNdienN/xozewe.pdfIn PDF document text
    • http://lesegot.iblogger.org/87354443063.pdfIn PDF document text
    • http://jamisixed.22web.org/43502022657.pdfIn PDF document text
    • http://lovefoxesi.iblogger.org/4963826997.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/66fcdbff-b7a3-4639-bdc9-800c86299101/beelzebubs_tales_to_his_grandson.pdfIn PDF document text
    • https://32cf4326-ba62-484c-a3ca-05d02c2dd2e5.filesusr.com/ugd/0b46e6_1b76f808b0ce45a98ee26df45120bbcf.pdf?index=trueIn PDF document text
    • https://37bcb4aa-7747-4ff6-a352-0e22bf983c21.filesusr.com/ugd/4393d3_0a77f7b5c35d4e68a4b2c397be746338.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/15d5972b-c54a-4e8b-92db-4c02e5afc190/garmin_zumo_660_latest_update.pdfIn PDF document text
    • http://juzoduseba.rf.gd/gazeputarawe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d979bcbb-d6e5-4d3f-b90f-88b617db4b41/vutuletoz.pdfIn PDF document text
    • http://muxobuduxude.epizy.com/crossing_positive_and_negative_jumper_cables.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea51a243-a2b5-4931-b7a1-bbbd6767d958/18586030315.pdfIn PDF document text
    • http://vagakidid.epizy.com/shinee_world_concert_iv_dvd.pdfIn PDF document text
    • https://80820154-e864-4b0c-832b-212b24169927.filesusr.com/ugd/c12414_64af92aab41c4b2896301f8862700b45.pdf?index=trueIn 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_off0000fed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED7 5412 bytes
SHA-256: 3d8273a8b02b5c4470069569e70f536cce85d45b1d095ff52bd9a7183a683663
font_01_sfnt_off0001113a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1113A 10416 bytes
SHA-256: 734776238b2f9c710604ff51a198f1909161c4702ffa2e12e5fe7b7837cde5f8

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