Malicious PDF — malware analysis report

Static analysis result for SHA-256 f44842262a66f8b3…

MALICIOUS

PDF

85.0 KB Created: 2021-03-04 20:18:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 762bdeaddbae7aa706fd658b474978fd SHA-1: 0d05af43c626dd0257dfd3668f7d23d8b88f834a SHA-256: f44842262a66f8b30c9e54724c46da0cd310205ff2882917f7e9ca113f673aac
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs point to various domains, many of which appear to be disposable or used for link farming, suggesting a tactic to manipulate search engine results or distribute potentially harmful content. No scripts were extracted, but the overall structure points to a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://gimoguvi.ru/award?keyword=can+you+connect+soundbar+to+monitor PDF link annotation
    • https://dakaxepipuzegi.weebly.com/uploads/1/3/4/8/134869431/676398.pdfIn PDF document text
    • https://fapufeloku.weebly.com/uploads/1/3/1/0/131071019/ligomobelirot.pdfIn PDF document text
    • http://free-at.pro/bible_for_dummiesm6nkp.pdfIn PDF document text
    • http://pro-komp-master.website/21588926937wu0p3.pdfIn PDF document text
    • http://garant-ritual.online/xitotemoserotofidikipazolpnxp1.pdfIn PDF document text
    • http://topplafond.xyz/12001504665c57oi.pdfIn PDF document text
    • http://mantenancie.com/tujozimagupasegogimusosirnnr3.pdfIn PDF document text
    • https://juviroxekeko.weebly.com/uploads/1/3/5/3/135399696/niweselalekexi.pdfIn PDF document text
    • https://cdn.sqhk.co/wiwuwigo/7wiivCO/39002828287.pdfIn PDF document text
    • https://cdn.sqhk.co/xoradofexul/JghlhaH/sentinels_of_the_multiverse_mini_expansions_list.pdfIn PDF document text
    • https://cdn.sqhk.co/fovipobex/ciigfJE/26922085821.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7be326e9-a1fd-4761-a84c-83c904220737.filesusr.com/ugd/37e945_dfbf53033537425b8fd34a828bfb1383.pdf?index=trueIn PDF document text
    • https://35b1a599-9f45-4897-82ce-59a931fc5495.filesusr.com/ugd/daca0d_9e20f8fc67144b1c86dec5203c8ef4fd.pdf?index=trueIn PDF document text
    • https://9534cc33-30dc-483d-bed2-8d5691710d48.filesusr.com/ugd/3835dd_f77edd96a0b545b1bdb831f752606b3f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f31a00c8-2c6f-457a-b31c-c65373da6324/1487067911.pdfIn PDF document text
    • https://8f6f9f04-f977-4239-955d-f6aecf2dd879.filesusr.com/ugd/81cd61_ae175e47b9ff4095bdcc2691b57b7453.pdf?index=trueIn PDF document text
    • https://625f08e2-3d8e-45b5-8e8c-b95d001c5c7c.filesusr.com/ugd/d94ae5_6f6b7328610e4728882ccd723f1b76c6.pdf?index=trueIn PDF document text
    • https://dd3528e8-ded0-4753-843e-0d3cb9f542e7.filesusr.com/ugd/4d6844_838c576cb02b40638d68d1cf07154a0d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4c26cb6-5c8b-4745-8c26-438b46c5bcd4/object_oriented_programming_java_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06b6da3d-b08d-45ca-acd2-ca6ab53613f6/the_master_key_to_riches_audiobook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5c47f74-8e3d-44aa-bcf1-77723e2575c9/toque_de_bandera_version_corta.pdfIn PDF document text
    • https://7afd96e6-4611-46d4-9b98-d111b897c281.filesusr.com/ugd/154221_fd3c77fbe2794024be936201b55294d9.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_off0000f9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E1 5200 bytes
SHA-256: 5244a85ec726b0cc9ed1642e5107cb3dab2cfd2a90c78cb8f24a0572a9dee353
font_01_sfnt_off00010b74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B74 11084 bytes
SHA-256: 134413d968141222396951d9532cc0599503d99deb6f96948fd1107a1c7dd00e
font_02_sfnt_off0001313a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1313A 16112 bytes
SHA-256: 1dd3cd7da05b03c596af54c9f68aa7089341e2b2e89c7eb924e854a94aa987db

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