Malicious PDF — malware analysis report

Static analysis result for SHA-256 d335772bca3d2a63…

MALICIOUS

PDF

83.4 KB Created: 2021-04-02 00:36:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 84a843c0a740c0b853f57ca4e030de92 SHA-1: c0c7e4574c90c6efe4d74f9fe77fe09d3e8a0ebb SHA-256: d335772bca3d2a639d3d7967cab2e672ab111f871dc641b0587ceb5265480d69
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://nipisod.ru/wix?keyword=pryor+junior+high+urban+dictionary PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4424682/normal_6065c52c573e4.pdfIn PDF document text
    • https://cdn.sqhk.co/lewikokezina/djXUvlI/kivudulatib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468294/normal_5fe9c57883798.pdfIn PDF document text
    • https://cdn.sqhk.co/wofikubid/ghMXGXn/no_man_s_sky_review_2016.pdfIn PDF document text
    • http://strapslap.online/definicion_de_estres_oms4jem8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412575/normal_602e287cb7ea9.pdfIn PDF document text
    • http://tryici.xyz/how_to_install_kali_linux_2020.1_on_virtualboxgqy9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481520/normal_5fd2a55526795.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465691/normal_6059e2496b5ec.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://76f5a3e5-08d8-4581-9975-6c1b933a1845.filesusr.com/ugd/dbbd16_7b3358773da14b44bc098f92d0e485d3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/beditepugasabopebuwur.pdfIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/satetifaxobuledajamogod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1630879-20cf-40e4-95a1-23b601baa52d/lokuwulu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf257b4e-0179-4229-b897-8447256b9554/24656455822.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a49b7050-3537-48cc-ad87-ad2dd4db7f51/26619076858.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/ramaxedogigozu.pdfIn PDF document text
    • https://4eff3ec4-d147-45d1-be73-876d9e1d0019.filesusr.com/ugd/efb3f0_ca00672e144b4fc0991e84a999abe930.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/adf1a261-d06d-4227-8e7f-6545d52841c6/best_i_test_robot_stvsuger_2020.pdfIn PDF document text
    • https://8f6f9f04-f977-4239-955d-f6aecf2dd879.filesusr.com/ugd/81cd61_16c063b81e4a4341a9cfba9d0f457a19.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF185 5308 bytes
SHA-256: ba58cdcd29e1b8aae6afef9511375972b26edbc73fa2db5cf67e94d762fd6960
font_01_sfnt_off0001039a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039A 10932 bytes
SHA-256: 720ef8b74bac2fdb622bf914827ffc940b5c1032f44722b6c462ca4c820289dd
font_02_sfnt_off00012943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12943 16512 bytes
SHA-256: d6fdebc11e3187d01325b87720ecbfc7b545ac777696e2432a455724985db1ac

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