Malicious PDF — malware analysis report

Static analysis result for SHA-256 32db8eb651fc01ee…

MALICIOUS

PDF

114.1 KB Created: 2021-03-22 01:23:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 211e53e4eab6cb38d6985a597b015deb SHA-1: 960a779167718a20da4a6cfec2fe726191b4f39d SHA-256: 32db8eb651fc01eeded3978e5668b684c86d7ac9c4d5ce0562635ee6183967fd
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 0.9998

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://leonvi.ru/wix?keyword=daily+language+review+grade+7+answer+key+week+2 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384817/normal_6056d0fb08fac.pdfIn PDF document text
    • https://pelepidavivi.weebly.com/uploads/1/3/1/4/131454492/3469960.pdfIn PDF document text
    • https://cdn.sqhk.co/nemoludajedu/njiR7ie/zejaweboxunukateru.pdfIn PDF document text
    • https://cdn.sqhk.co/xogovofofi/b6Cihjb/space_flight_simulator_mod_apk_download_android_1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448719/normal_603683cf40859.pdfIn PDF document text
    • https://cdn.sqhk.co/dofewijoras/jgfgRja/forward_financial_bank_marshfield_hours.pdfIn PDF document text
    • https://lelameju.weebly.com/uploads/1/3/4/0/134040913/tupokijo.pdfIn PDF document text
    • https://cdn.sqhk.co/jenireni/jaIgjie/fopufotomakebupagijubigid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417669/normal_602b55abf103b.pdfIn PDF document text
    • https://cdn.sqhk.co/lokutibu/62ghYgH/nanigewaxafek.pdfIn PDF document text
    • https://viwosakizipisot.weebly.com/uploads/1/3/5/3/135321869/1285537.pdfIn PDF document text
    • https://cdn.sqhk.co/tedavevata/djho6fw/css_gradient_style_sheet.pdfIn PDF document text
    • https://cdn.sqhk.co/sirepajaku/AhaA6ig/save_the_manatee_5k.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370529/normal_5fd9392281068.pdfIn PDF document text
    • https://ginijamuda.weebly.com/uploads/1/3/1/4/131409148/mulono.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/71f0aee7-3689-4160-a10b-9455bc9146fe/quran_kanzul_iman_urdu_translation_download.pdfIn PDF document text
    • https://41c240d9-b4af-4f88-8fa4-2a41cce3a287.filesusr.com/ugd/01bc73_85170ec331794569a118cb2c692527e8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/695b3540-2063-4fc6-9e2d-f44593a749ec/ue_megaboom_3_specs_watts.pdfIn PDF document text
    • https://7f03322d-63d6-449b-a8c2-a80beffeb2b6.filesusr.com/ugd/2994dd_9595e0474ae644f58bd7732736282a74.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/35c36d9f-d786-4187-8637-acfcd20ae29e/niv_life_application_study_bible_large_print.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_off00017dc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DC9 5524 bytes
SHA-256: 54140c0e0d42ea73ffc803beb2a9ea90561c9f02afcf37e2792fa3a09a7a1c66
font_01_sfnt_off000190d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x190D1 13012 bytes
SHA-256: d1b694ac972edc447325782d7675d292635e5cd1a52058a518f3d11b7fc71e35