Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ea4983d3c8f7189…

MALICIOUS

PDF

69.0 KB Created: 2020-12-18 04:16:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: d70e7b19fd9a8c01fcbf03b2103f55cc SHA-1: 18f59f77f2ea202299cf6e63b3bc5e00cb1956e7 SHA-256: 9ea4983d3c8f7189102a1d282ae7dd5758a1efc1b61f47e4ed009fbc3e36bc63
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 pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafftec.ru/123?utm_term=hit+refresh+pdf+book PDF link annotation
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/1158663.pdfIn PDF document text
    • https://zevijilutijeso.weebly.com/uploads/1/3/4/8/134850931/xoxijeta.pdfIn PDF document text
    • https://bunemevomuw.weebly.com/uploads/1/3/4/7/134733911/lunabijazutorijewuda.pdfIn PDF document text
    • https://subefivu.weebly.com/uploads/1/3/4/6/134688636/tegakufatodakum.pdfIn PDF document text
    • https://buxiwizekekaxe.weebly.com/uploads/1/3/4/6/134662233/sedab.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/3d477396-c5f8-49b6-b24e-e423e7e68d05/udp_open_demonii_com_1337_announce.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc27b7e60f2895dc1f1e23b/t/5fc49ea27acac6192a53f700/1606721187128/nfpa_30_above_ground_storage_tanks.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe3edbfa04221c71ec888b/1606303451804/xivulamegoroneka.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc72271418d7934ac756570/t/5fca2d0f887b444c615f5c29/1607085327964/coc_free_gems._xyz._clash_of_clans_hack.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabisura/59904827152.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3f49b12-10a9-4ba3-ad6b-76876cfc9b18/46135146869.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_off0000d198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD198 5052 bytes
SHA-256: 318980a4c7c808b68615afae8a70a97dc85ec6f7ea937d84ee022ff250371b16
font_01_sfnt_off0000e2bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BB 10764 bytes
SHA-256: 88cac7f479f4b8aaa6879454161cf53d2ddbbf5c2bd63d1f016aecf6d324a44e

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