Malicious PDF — malware analysis report

Static analysis result for SHA-256 075396904ba08e9e…

MALICIOUS

PDF

79.5 KB Created: 2021-06-07 08:51:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 4cb09e2b4dec1524f10fa50e314b7404 SHA-1: cbd225b98c31f6946609af5c25dc9d9f0d95b8dc SHA-256: 075396904ba08e9e2eada4e6e1e5b3cafb4eb2ee52121c1a56175b40001b762d
126 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded links, many pointing to disposable hosting or link farms, indicating a likely attempt to direct users to malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a link farm designed for SEO manipulation or to host phishing content.

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://pistant.ru/pbw?utm_term=verbos+acabados+en+s+ingles PDF link annotation
    • https://zabivavisona.weebly.com/uploads/1/3/1/4/131452967/8435501.pdfIn PDF document text
    • https://litufefanim.weebly.com/uploads/1/3/4/9/134901191/xiralesolej-gowusewozika.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391340/normal_6005600b9349a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408481/normal_5fc677c1b1a70.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zufiwuz.pbworks.com/f/wixatagagezekudaxekaju.pdfIn PDF document text
    • http://xesimisejek.pbworks.com/w/file/fetch/144606219/miwalufetusat.pdfIn PDF document text
    • http://fudotedafeji.pbworks.com/w/file/fetch/144770973/59112745911.pdfIn PDF document text
    • http://sepaxebi.pbworks.com/f/45206252935.pdfIn PDF document text
    • http://mabigeroxoso.pbworks.com/f/66225657551.pdfIn PDF document text
    • http://zizovitunex.pbworks.com/w/file/fetch/144487962/how_to_switch_on_keyboard_light_in_dell_latitude_laptop_e5450.pdfIn PDF document text
    • http://zawepiko.pbworks.com/f/zufogijakeruzupofun.pdfIn PDF document text
    • http://tusoxefum.pbworks.com/w/file/fetch/144478974/how_to_set_up_call_forwarding_on_iphone_xr.pdfIn PDF document text
    • http://fubajulak.pbworks.com/f/libigususulugiwavi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f39b10d-8c6f-4e4f-9119-9dab3ede29ca/vibibuva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af1cb12b-4dc9-4b94-9179-9184fb755dcd/50574110728.pdfIn PDF document text
    • http://jabodawo.pbworks.com/w/file/fetch/144601362/app_para_conseguir_diamantes_gratis_en_free_fire.pdfIn PDF document text
    • http://mapaduzipi.pbworks.com/f/how_to_set_up_controller_for_super_smash_flash_2.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_off0000f53c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53C 5212 bytes
SHA-256: fc4f44b6221f72c1a4b7e048a649a8d0f8776a3ac8c64d25b4812af63d9a21fb
font_01_sfnt_off000106ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FF 12548 bytes
SHA-256: 5c7b81e301c9d44fb421399fa2fa7bd440541ecb9da8de9a5598aed47211dac4

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