Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8cd497978589e6b…

MALICIOUS

PDF

75.4 KB Created: 2021-03-19 03:15:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d59d65d2d724d1253bc2c389205baf4f SHA-1: 20312612191c9147b83601565520f413f01dd1ba SHA-256: c8cd497978589e6b43007c1353f7756db4296d104786a6ac2627d74bdfea4758
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 0.9996

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://zajinet.ru/award?keyword=bcg+matrix+explanation+pdf PDF link annotation
    • https://lerinaxupol.weebly.com/uploads/1/3/4/6/134662503/bujifofimoz_luwoside.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458137/normal_604b973139425.pdfIn PDF document text
    • http://worelimupuvefam.mywebcommunity.org/autonomic_nervous_system_pharmacology_mcqs.pdfIn PDF document text
    • http://euroshopme.site/dimimotanosuvabisegevunav8u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375095/normal_6013a2b8c9d81.pdfIn PDF document text
    • https://fikadodovawewa.weebly.com/uploads/1/3/4/3/134320255/sixiziwujuxo-wepupomelix-jukemavixusoti.pdfIn PDF document text
    • https://mepalowe.weebly.com/uploads/1/3/1/0/131070826/903657.pdfIn PDF document text
    • http://help-copyrightservice.xyz/bodovujegefazumonepark6e2.pdfIn PDF document text
    • https://diloxutal.weebly.com/uploads/1/3/4/5/134598378/9791627.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366661/normal_602e0cf1645c4.pdfIn PDF document text
    • http://vulgargirls.fun/drugs_safe_in_pregnancy_chartb2log.pdfIn PDF document text
    • https://rorezumi.weebly.com/uploads/1/3/4/5/134591247/midimatakukorovojini.pdfIn PDF document text
    • https://vepegusekukoj.weebly.com/uploads/1/3/4/4/134470637/sanelelaru.pdfIn PDF document text
    • http://wisecredit.info/taranavefawugo3xz2x.pdfIn PDF document text
    • https://ditakusoboke.weebly.com/uploads/1/3/1/4/131437623/4f5f029.pdfIn PDF document text
    • http://jolidulikan.scienceontheweb.net/wepitixowutomo.pdfIn PDF document text
    • http://xepuxupipe.mywebcommunity.org/propiedades_del_amoniaco.pdfIn PDF document text
    • http://shoplus.info/29490261741rbtgx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nononulavojiki.myartsonline.com/dremel_400_xpr_workshop_kit.pdfIn PDF document text
    • http://forojiwimudobo.atwebpages.com/club_car_precedent_seat_hinge_repair_plate.pdfIn PDF document text
    • http://mawokale.myartsonline.com/alone_together_full_movie_summary.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_off0000e655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE655 5416 bytes
SHA-256: 20028b81f9912b4619f906b327f6469cd4a886f5c4f91f9a5ad191d61df61170
font_01_sfnt_off0000f8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AD 11584 bytes
SHA-256: e649f3fb0dd4ec25d351efd1c2867956fd851b21bc58df34e13526845dff9919