Malicious PDF — malware analysis report

Static analysis result for SHA-256 90824f26d0319ce0…

MALICIOUS

PDF

78.7 KB Created: 2020-12-25 23:57:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: faf05e4ca3e15316a96b2bf7c42db371 SHA-1: 1fbe0c044ac0b29291de8ba78935587681b03c75 SHA-256: 90824f26d0319ce067b494d2dd9048cb8b77962d7567b585df926e0f1fa144ea
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 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://trafftec.ru/strik?utm_term=guitar+flash+cards+app PDF link annotation
    • https://cdn.sqhk.co/dakagugi/igRggEu/pesara_pappu_curry_tayari_vidhanam.pdfIn PDF document text
    • https://kogevinipuban.weebly.com/uploads/1/3/4/5/134514077/8398146.pdfIn PDF document text
    • https://sujajikozodes.weebly.com/uploads/1/3/1/3/131384638/658e3622f03381.pdfIn PDF document text
    • https://cdn.sqhk.co/bugabowozi/Ljiggjj/withstandz_zombie_survival_apk_hack.pdfIn PDF document text
    • https://dimejozetef.weebly.com/uploads/1/3/1/0/131070151/8f55f59b.pdfIn PDF document text
    • https://jiresuzava.weebly.com/uploads/1/3/4/7/134706808/a2cd97011f5753.pdfIn PDF document text
    • https://nazasakodaz.weebly.com/uploads/1/3/4/6/134667833/maniwapesanaxu.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/73143fd3-d772-4567-b29a-eda27fb5affc/lunijegenupimesiri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba6e04b3-20ca-4f27-b103-7e65c1cdeee0/arcanum_save_editor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46d6f6bb-c196-46a1-a853-923c8df897cb/recipe_for_cartography_table_minecraft.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad6bd2cd-0511-479f-945d-29f8139b48ac/wijupegomewisa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3b934d4-a8a3-43b7-846c-70d55216505d/cargo_securing_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05f5bc78-2d98-4b84-b6fd-3d0042ba0d17/high_temp_glue_home_depot.pdfIn PDF document text
    • https://s3.amazonaws.com/bajuse/dragon_ball_xenoverse_apk_for_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c9a0b3b-bb01-4b6b-98b8-2defb1fe7c0c/11534573324.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
    • 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_off0000df3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3D 5272 bytes
SHA-256: bdd6a26ef5d12595858433b6042457d15f6123da681b06d8e25c1a4bde39bb35
font_01_sfnt_off0000f12d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12D 11284 bytes
SHA-256: 2ea84aa50b2372df11a984990dbb5823c338ea7ec184eb8c5fe1378754e74a9a
font_02_sfnt_off000117bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BD 16336 bytes
SHA-256: b7ec44cfe2208ace95a2ce43e698390e22c67aa42018be4a86f0f90cbe714ace

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