Malicious PDF — malware analysis report

Static analysis result for SHA-256 321cd71325150451…

MALICIOUS

PDF

76.0 KB Created: 2021-03-30 00:49:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 405f0ffa057e566b1af9af47cce22645 SHA-1: 8150dfdbf55ab93c619b73af0009f33f9e49b35d SHA-256: 321cd71325150451f78fbe6eccdf2fad947078bb34e1716d0edd3dab8f8ff902
186 Risk Score

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 0.9991

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://vilenefex.ru/strik?utm_term=cuanto+es+150+gramos+de+azucar+en+una+taza PDF link annotation
    • https://cdn.sqhk.co/dufelogaruf/hZ6bYlC/71034299125.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460447/normal_603e611d215f4.pdfIn PDF document text
    • https://cdn.sqhk.co/xubuguxovim/jjdhfgg/dimple_bts_piano_sheet_music.pdfIn PDF document text
    • https://cdn.sqhk.co/xojelumegasi/jgggRgd/download_stickman_falling_mod_apk_unlimited_money.pdfIn PDF document text
    • http://vazewuxu.mywebcommunity.org/carbon_steel_material_specification.pdfIn PDF document text
    • https://cdn.sqhk.co/kotolodegag/jfTV1u1/incivility_in_nursing_statistics.pdfIn PDF document text
    • https://cdn.sqhk.co/sadirurafixi/dCjijbr/68711074317.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374372/normal_5fcf0702ebf9b.pdfIn PDF document text
    • http://vasakuso.sportsontheweb.net/70215590259.pdfIn PDF document text
    • https://cdn.sqhk.co/potebuso/HBegiic/crosswords_with_friends_cheats_10_16_20.pdfIn PDF document text
    • https://cdn.sqhk.co/supetuzitepi/gf4idhb/caveman_adventure_download.pdfIn PDF document text
    • http://sijemogezabusa.sportsontheweb.net/711380501.pdfIn PDF document text
    • https://cdn.sqhk.co/jigavozef/mIsVrge/188919887.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/4afc969c-baf2-4427-b5c4-14f4a312ccbe/mibax.pdfIn PDF document text
    • https://2a983b51-2e13-4971-8c1f-a5bca3ab4353.filesusr.com/ugd/e1a791_8d2f84949606486baffdc03d74368914.pdf?index=trueIn PDF document text
    • https://aee666f7-65d2-4416-8089-42e5bd85255d.filesusr.com/ugd/c4036c_2cda2d88a7c4492fb5757bbf8227a6be.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd63b7da-208e-482c-ac8e-d28a0d58af31/power_cooker_instructions_youtube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d0e6d29-c05b-4e33-b062-fd0edc444930/81819003294.pdfIn PDF document text
    • https://148d48ef-a78d-4e34-a4d2-755cfbac042a.filesusr.com/ugd/ccca9b_982b12d820a54ba4a3d45791ea508e49.pdf?index=trueIn PDF document text
    • http://rogofideb.onlinewebshop.net/6759981138.pdfIn PDF document text
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_638880c47ef44aad865867011e416dea.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3773482a-4c18-411c-86b4-0fee48a855a3/jiniseb.pdfIn PDF document text
    • http://ludugatitabi.atwebpages.com/fur_elise_piano_tab.pdfIn PDF document text
    • https://e5baaea7-7007-41de-9367-4ebf3ed55875.filesusr.com/ugd/8e1900_f2369d92f20248f6b873b77cf142702f.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B0 5500 bytes
SHA-256: dfa9aad3bcb617136f032f377b1c99e1615c371fbfaf914dcbe50cfa2e7df550
font_01_sfnt_off0000f957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF957 12120 bytes
SHA-256: 459b8b8b83ee660658b0de2b3932a70888b1b4ef44ad32fe3dbc89954ddb6f52