Malicious PDF — malware analysis report

Static analysis result for SHA-256 68e965bb557ed65c…

MALICIOUS

PDF

80.5 KB Created: 2021-04-24 00:40:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 72a24d3f4633566babaea60507c123ef SHA-1: decbe994a0f25d1ff8e8f3aaa75d3f60e995d993 SHA-256: 68e965bb557ed65c487d780cd06bc3829ba48df468dee0437fb5167e26ea6ec1
194 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/strik?utm_term=california+5th+grade+math+textbook+pdf PDF link annotation
    • http://bosemefawixuwov.mypressonline.com/93964952821.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413696/normal_5fdd37c09b1e9.pdfIn PDF document text
    • http://vodabutopidaru.getenjoyment.net/vegetarian_diet_plan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408863/normal_60164a65b1faf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386365/normal_5fdc5216a4fa8.pdfIn PDF document text
    • https://wojopegoguw.weebly.com/uploads/1/3/4/6/134690206/gegebejadomokomuner.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386366/normal_601281200a797.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387061/normal_604b4f6901411.pdfIn PDF document text
    • http://lorewipa.scienceontheweb.net/other_blood_groups.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496585/normal_6068c9a4b65ed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453551/normal_6001205a631be.pdfIn PDF document text
    • https://xufiridib.weebly.com/uploads/1/3/5/3/135346556/f7462575013.pdfIn PDF document text
    • http://wumewil.sportsontheweb.net/electrical_engineering_course_outline_knust.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381105/normal_600b1ff4b2e73.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481397/normal_5ff1bb0f4059e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485826/normal_60516ede4f1e8.pdfIn PDF document text
    • http://sitizinudex.getenjoyment.net/gonexinif.pdfIn PDF document text
    • http://sevezor.scienceontheweb.net/sevusobugefugupixuguli.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370744/normal_5feb0bb0eb161.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://marurutefa.atwebpages.com/vacuna_neumococica_conjugada.pdfIn PDF document text
    • http://tebuwawezizafes.onlinewebshop.net/chefschoice_trizor_xv_edgeselect_professional_electric_knife_sharpener.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE93 5484 bytes
SHA-256: 6014752f729a91e1d2a367984b10233854c3891f957755a6c2c6fa2402207909
font_01_sfnt_off0001010f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010F 10804 bytes
SHA-256: 45b91b84a81df1285a117204c8c5517d69f0f7940da1fb8fe7453b6845a91b08
font_02_sfnt_off000125e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E2 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361