Malicious PDF — malware analysis report

Static analysis result for SHA-256 3caf07bf065e048b…

MALICIOUS

PDF

75.7 KB Created: 2021-04-04 08:44:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: aedef7c5c71617e785010c53c7d46636 SHA-1: 107aa7ffa1b7adf3f28272b831b9fd9964df2cc1 SHA-256: 3caf07bf065e048b74182050c64c9971cd1cd01e5bab1c5fe2096976a119ce90
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://jottigo.ru/award?keyword=grammar+test+for+7th+grade+pdf PDF link annotation
    • http://bridgecommerce.com/jasatagepopth9o.pdfIn PDF document text
    • http://vknart.xyz/velezup3n1p.pdfIn PDF document text
    • https://cdn.sqhk.co/dunuxorigu/if5hcgh/nobubejebozizuvipamovaxev.pdfIn PDF document text
    • https://cdn.sqhk.co/leporolino/cijhaic/classic_words_solo_pour_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/zufuxirap/hrWIfji/snappers_fish_and_chicken_miami_fl.pdfIn PDF document text
    • https://cdn.sqhk.co/zosiwutu/ghfIjii/26256175575.pdfIn PDF document text
    • https://cdn.sqhk.co/bizujonad/EGShaDo/vuzenuwogojudixuzetije.pdfIn PDF document text
    • http://wizuvadidena.iblogger.org/sidib.pdfIn PDF document text
    • https://cdn.sqhk.co/bureruverog/cjgx2gf/sojakajolazefexuta.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6bc61794-ec17-45f1-96eb-8bed4cd57308.filesusr.com/ugd/217b8a_e868ab071f6047088a7349496c13dc91.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd3f0424-c2dd-4614-9512-ad09fb9e3867/oster_regency_kitchen_center_meat_grinder_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfc1b7de-6329-4b9d-9a46-55eedcbe3d8a/will_it_snow_in_eugene_tonight.pdfIn PDF document text
    • https://a815f367-2516-4b88-9496-eed07d5c1eb7.filesusr.com/ugd/665c20_02d2d0a7ff4e45ceb010b42e9b594c75.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/66899fb3-8c19-46c7-9257-1623024ed23a/5_stages_of_grief_cycle.pdfIn PDF document text
    • http://midelex.epizy.com/2006_chevy_trailblazer_service_manual.pdfIn PDF document text
    • http://lekanun.epizy.com/tixisanojafir.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_off0000ec03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC03 5536 bytes
SHA-256: b5698db8a9900025753302ba24297b1d0acb32e46747bdfcb37371eecd897f4c
font_01_sfnt_off0000feb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB5 10232 bytes
SHA-256: 2a03c37138eb68e47de0cd634d9500105672516a3c837917bd1c0be1c19a5492

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