Malicious PDF — malware analysis report

Static analysis result for SHA-256 43a31453b3be2bef…

MALICIOUS

PDF

71.1 KB Created: 2021-03-08 08:57:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 20bcaddb987be41860a40d71eecacbd0 SHA-1: 8cb4007cd937863e9b6eeca543e5e8cf522516b9 SHA-256: 43a31453b3be2bef610ae1e2238acf152273be40d0e568cc963c3691638d6688
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, containing numerous external URLs pointing to other PDF documents. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO manipulation or to distribute further malware. The presence of multiple disposable hosting domains and unknown reputation URLs reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://fokemale.ru/wix?keyword=anna+riva+power+of+psalms+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413842/normal_5ff93032cba38.pdfIn PDF document text
    • http://pubguckazan.com/57618527199mhagv.pdfIn PDF document text
    • http://chempion.coffee/dikupuxutowozinupxpz8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479718/normal_6036c1e07e1ea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447431/normal_5ff278ccc6ade.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ca30e0e0-ecf2-44ab-b6a2-fe26291458be.filesusr.com/ugd/34e21e_fc0d02863ed84a758e170abde84e01be.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fdefcc2-b9f9-49a8-b29a-2105b18becb1/d-link_dir-615_wireless_n300_router_configuration.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba64c1bb-95f6-4940-b3b3-88d223ca8d9a/mitsubishi_mr_slim_maintenance_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e76dad06-0dde-4682-88cc-d5da08429b25/feviponitofos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d49228e-2413-4547-8a94-e861245a9e6f/how_to_adjust_a_centerpoint_scope.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e44d1862-bf6e-4401-bf9e-9e616157c01d/how_to_get_a_ga_drivers_license.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a727d52c-ea5b-4dce-b227-b928cf152cd2/dunkin_donuts_drink_menu_prices.pdfIn PDF document text
    • https://1afae0f6-9e35-4dc9-9db7-5dbf78511926.filesusr.com/ugd/afe78f_4e43b4f9156d48b0b924fce04dbb90ab.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/505e237f-c0c0-42c1-82bb-297eef6ac869/zawuma.pdfIn PDF document text
    • https://fab88ded-2f12-46c9-b6ec-f290036286cc.filesusr.com/ugd/cce69c_45fec6bb54db4cef9191c50061e983fa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/defaf553-fd80-4e9a-a50d-a52c90f75194/nusug.pdfIn PDF document text
    • https://21a67f6d-2aea-439f-a910-ed4feb6be009.filesusr.com/ugd/173616_28ab3ae71c9c42b993919917ec07e49c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/077b1d07-13ee-4ad8-816e-c8b0dbb4d870/liftmaster_not_closing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a7a4de9-49fd-466a-a7d8-aa9b823cef27/judizafesugolu.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_off0000d9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EB 5328 bytes
SHA-256: 6696a208891d2bea64e151f801ffe625a12fd30264befb039546a25d41d703a3
font_01_sfnt_off0000ec0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0D 10376 bytes
SHA-256: ad9503fb104d4e8d037d62db6c4426e987aba93220d4226c45d89f68760ff094