Malicious PDF — malware analysis report

Static analysis result for SHA-256 8adfafc7aa755870…

MALICIOUS

PDF

79.1 KB Created: 2021-03-09 17:54:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: e66682d1e0a1577aaf114348f80b05d8 SHA-1: 65184e446439874ffea6b1c70974e79dbcce188e SHA-256: 8adfafc7aa7558707c23d248a346bf2ae0bbc29f7ce26e8d7241419d715b7e99
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with at least one heuristic indicating it's part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links. No scripts were extracted, but the PDF structure and URL analysis point to a common phishing or downloader pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/award?keyword=canibalismo+azteca+pdf PDF link annotation
    • https://cdn.sqhk.co/lisakopew/Ziahbyw/68895497088.pdfIn PDF document text
    • http://vaxisezawoged.scienceontheweb.net/how_to_tell_when_to_pick_sweet_potatoes.pdfIn PDF document text
    • http://xiwupulo.medianewsonline.com/94238294118.pdfIn PDF document text
    • http://rejawulomov.mywebcommunity.org/what_are_the_health_and_safety_regulations.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385217/normal_6046841c8d9a9.pdfIn PDF document text
    • https://cdn.sqhk.co/nejibija/ijjijyF/82269759138.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380068/normal_6028658750357.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374188/normal_5fd7e00922325.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/desekusoxi/kafazidadilumomebiseka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b556e6d0-cbbe-485b-b216-2643e244e4bd/97600436825.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/last_of_the_mohicans_cast_1957.pdfIn PDF document text
    • http://pazizota.rf.gd/rofepiwekufofofabo.pdfIn PDF document text
    • http://gefuxuxoj.epizy.com/persil_coupon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b81bc73-4c20-4ac8-9761-dbb15431b7b1/what_is_an_example_of_an_ion_dipole_interaction.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3adacd3-b381-4440-8143-8c865a87c6fd/nufumefusojofelupil.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/beriveturojoguro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1531f213-b8cb-4da9-9927-9772f79e89af/22325678855.pdfIn PDF document text
    • http://rowesotinik.rf.gd/quotation_format_in_excel_sheet.pdfIn PDF document text
    • http://malunazix.rf.gd/9714933585.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/009aa189-b151-4f5a-b1f4-bfe6ee8f0a68/zuzinop.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_off0000f99f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99F 5300 bytes
SHA-256: de58935fd08e5a3b2257172d72aee10ae0523a65626ab57411e7288b3d2ea311
font_01_sfnt_off00010b97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B97 10468 bytes
SHA-256: e3fa0341e7cc1cd1ec4f17b82f3a163f1d85d11ff02559183b803cf7b8ea92dc

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