Malicious PDF — malware analysis report

Static analysis result for SHA-256 26c98f10a97b34fe…

MALICIOUS

PDF

77.3 KB Created: 2021-01-25 23:50:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 74cf2ce1040d09b6e51de4113017aa6d SHA-1: 7b17cadf49cf27e5376ec2ba4c87419bbfbe03f7 SHA-256: 26c98f10a97b34fe53b417b8d8cf45b716676a41275b81d95bab2c4bf8ec42f6
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links pointing to various domains, many of which appear to be disposable hosting services. This behavior is indicative of a link farm, often used for SEO manipulation or to distribute further malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution.

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://seumenha.ru/123?utm_term=clark+y+airfoil+coefficient+of+lift PDF link annotation
    • https://tudadakamoziv.weebly.com/uploads/1/3/4/5/134596668/54094.pdfIn PDF document text
    • https://fonekukiko.weebly.com/uploads/1/3/5/3/135393218/4699635.pdfIn PDF document text
    • https://satizivuzaked.weebly.com/uploads/1/3/4/3/134383512/e36db9.pdfIn PDF document text
    • https://serarabasujuz.weebly.com/uploads/1/3/1/6/131606617/75f0d.pdfIn PDF document text
    • https://cdn.sqhk.co/falupuvevore/fFgjwjc/dr_viruch_vachirakorntong.pdfIn PDF document text
    • https://balabirow.weebly.com/uploads/1/3/4/6/134690292/bokelivarejidogav.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446930/normal_6003f363f2871.pdfIn PDF document text
    • http://morj.space/fancy_pants_adventures_world_4_remixlcl8n.pdfIn PDF document text
    • https://zogadinarele.weebly.com/uploads/1/3/1/4/131409244/27bd2.pdfIn PDF document text
    • https://bisulejejokix.weebly.com/uploads/1/3/4/0/134042342/6453867.pdfIn PDF document text
    • https://sinekagu.weebly.com/uploads/1/3/4/8/134855021/berojonumenazelite.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://karifopiti.epizy.com/airtel_dish_tv_remote_control.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_off0000dd03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD03 4672 bytes
SHA-256: e8c188d1dfc3ac65124ef8e5b38c9f4067fb95801ef86c5df7f718478923b82b
font_01_sfnt_off0000ecfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFE 14236 bytes
SHA-256: 2ec0fe683dca60fd1d5f5ba982489dd1486cfe0afbee0febe222403271104512
font_02_sfnt_off000118f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F7 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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