Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3a767672032d637…

MALICIOUS

PDF

73.8 KB Created: 2021-05-30 08:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 3ba3889cbf7cd679734cdaaae5b9a28d SHA-1: 84c4654d687c4643a5ca88c65e6a2627a5648584 SHA-256: e3a767672032d63710d53a75d64cbd066efcf8d8280b8c1f3a494b7b0f55aa44
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

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://seumenha.ru/123?utm_term=dauntless+mid+game+guide PDF link annotation
    • https://vonenefanor.weebly.com/uploads/1/3/4/6/134638091/rusuparilu.pdfIn PDF document text
    • https://nunubawuguxage.weebly.com/uploads/1/3/7/5/137504951/e3ce064.pdfIn PDF document text
    • https://vaxinukosiju.weebly.com/uploads/1/3/4/6/134625250/6662944.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469386/normal_60421f1cc47ed.pdfIn PDF document text
    • https://jajamavufivaz.weebly.com/uploads/1/3/4/2/134235884/tagebeki.pdfIn PDF document text
    • https://kurajefofukagi.weebly.com/uploads/1/3/4/8/134895289/9394639.pdfIn PDF document text
    • https://vififeroxesazu.weebly.com/uploads/1/3/4/7/134737415/tegigop.pdfIn PDF document text
    • https://xebokedobonu.weebly.com/uploads/1/3/4/7/134719403/dukulomuluwedasuwi.pdfIn PDF document text
    • https://zelerajolames.weebly.com/uploads/1/3/0/7/130776056/xirebagetewiwu.pdfIn PDF document text
    • https://xovoxabazilepot.weebly.com/uploads/1/3/6/0/136054719/golekef-voluf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369901/normal_6011c3da2cf79.pdfIn PDF document text
    • https://raxaregos.weebly.com/uploads/1/3/4/3/134363135/fodisa_fepexago_fejumepidebezu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481675/normal_6006a9284237a.pdfIn PDF document text
    • https://gawugabel.weebly.com/uploads/1/3/4/3/134361726/lipazev.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/137ac0a1-5976-4a42-8444-ff8900f67265/xafiliguvagemavi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20e435d8-f8b1-4057-addf-e248f5acc8bf/share_investing_for_dummies_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b724e081-a3a6-4dd5-b831-0177641d432a/23937392643.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ef4f0eb-3d47-4448-9ec6-bbe19f4618e7/what_does_temporary_employment_agency_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28d032d9-3ca4-4276-bf11-4770924a77a7/will_world_war_z_2_happen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dc3c79b-8277-42c4-a8ff-7bd25d203e59/20211552121.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cea7dda-3ea1-42cb-9265-86ca6a95ced5/photive_hydra_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4b451fb-e1e5-43b9-a472-2473133920f6/zujamusifenexajak.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_off0000e4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F5 5048 bytes
SHA-256: 2c603e94a475695e388cacbe2d782397bb8cc31d544098c3da52b8e6dfdf20d5
font_01_sfnt_off0000f615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF615 10596 bytes
SHA-256: e2577c306d9c1a3a069eb7dcdbd2556a621c1d465dae9bcefbc8ecc3ef8e84d6