Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a09f26d64e8d731…

MALICIOUS

PDF

72.6 KB Created: 2021-03-10 03:44:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: bf5bfdedc192e9e798d166f1474002ef SHA-1: 9921e8bb44857531ca7e3c3206a0f5fe4ebcea55 SHA-256: 5a09f26d64e8d731a45c3ada0b80d0cdde3cf3533eaad2b50b61311d9a94448d
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 0.9998

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://seumenha.ru/strik?utm_term=how+to+join+webinar+in+google+meet PDF link annotation
    • https://ludefojixik.weebly.com/uploads/1/3/5/3/135347049/sefopu_nudinasugabu.pdfIn PDF document text
    • https://cdn.sqhk.co/nebafori/ejatqjd/39170838895.pdfIn PDF document text
    • https://vefonero.weebly.com/uploads/1/3/1/0/131070196/07411890c2.pdfIn PDF document text
    • https://cdn.sqhk.co/lajawawinu/Djfidew/valasajopa.pdfIn PDF document text
    • https://xabetibupu.weebly.com/uploads/1/3/0/7/130738966/fbcbd9.pdfIn PDF document text
    • https://bemuzulezevateb.weebly.com/uploads/1/3/4/4/134440878/zalidumogulojono.pdfIn PDF document text
    • http://jelojutu.sportsontheweb.net/96357687478.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d71fc03c-aea6-48f7-a990-8afffb22108d.filesusr.com/ugd/3de8a6_c5057b844abc431eb0247906da1f51a0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/888b092a-9a1a-4dcf-b1ba-cebc34e5422b/5018545005.pdfIn PDF document text
    • http://wolobugoxew.myartsonline.com/john_deere_walk_behind_mower_parts.pdfIn PDF document text
    • https://e0ff2378-281a-4ea3-95ae-419c526fdc99.filesusr.com/ugd/0baf77_110bb8d307684c2bb3c3adf7b6522ca9.pdf?index=trueIn PDF document text
    • https://c1cb471f-fc5c-4ef2-b3e1-4d0d0d09d135.filesusr.com/ugd/cc5b41_7860087e884444ec8474680119f3f353.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/the_abandoned_empress_light_novel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b2f8436-5c5b-4952-ac77-187a05de8e43/milasumazonevare.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/aneurysm_saccular_fusiform.pdfIn PDF document text
    • https://a54de82d-0003-4787-801b-d7ee719c780a.filesusr.com/ugd/8d57bd_ac9c108aa91a49a7827e18efe1a12eba.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f9480fe-f51d-4d77-8a41-e14222752455/zimafofu.pdfIn PDF document text
    • https://314a97e4-cc7b-499c-a999-42b15fb65c39.filesusr.com/ugd/fa4a73_9f8dcfda46f041c48723ff250924e0bd.pdf?index=trueIn PDF document text
    • http://bitenozof.atwebpages.com/30652232115.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/everyman_play_analysis_death.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_off0000e0f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F3 5096 bytes
SHA-256: ddb5bb74b217f979c9f31941b8ea366612ba911ea20c3ac8f92d95b6f434a478
font_01_sfnt_off0000f24c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24C 10292 bytes
SHA-256: 3061fbed17fc556fd22226f16a1f2a76eda544e40492eaccdcb1dad3b075d336