Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d650cde2766c4eb…

MALICIOUS

PDF

63.6 KB Created: 2021-02-08 11:27:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 129a7aa70075700ab44f0daa740057f1 SHA-1: 95e626ea913d336eb16d131cfa13d3dc2ed180c1 SHA-256: 9d650cde2766c4eb69459b293c09bb8cc5474c309814480be888c5915607c115
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards an attempt to redirect users to potentially harmful content.

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://leonvi.ru/123?utm_term=jbl+endurance+peak+headphones PDF link annotation
    • https://cdn.sqhk.co/wezufunin/hcMHidU/fake_call_app_with_voice.pdfIn PDF document text
    • https://cdn.sqhk.co/nubokeso/iahihbh/50010530983.pdfIn PDF document text
    • https://cdn.sqhk.co/fapolokid/ifyhegf/42696450828.pdfIn PDF document text
    • http://hookup154.site/mirror_lake_utah_boat_rentalmmk4o.pdfIn PDF document text
    • http://love-cosmetics.shop/skyrim_tertre_dyngol026dn.pdfIn PDF document text
    • http://mignonette.space/pakinarawajukikabbevi4.pdfIn PDF document text
    • http://verenica.net/4359758368hs1hp.pdfIn PDF document text
    • https://cdn.sqhk.co/tivuzofep/gquyhhS/multi_space_64bit_helper.pdfIn PDF document text
    • https://cdn.sqhk.co/sepagumal/icxgdgj/hitman_2_walkthrough_mission_1.pdfIn PDF document text
    • https://cdn.sqhk.co/puzadowoke/gdAR9ih/only_one_you_preschool_activities.pdfIn PDF document text
    • https://mewupevubuk.weebly.com/uploads/1/3/5/3/135387541/roxumofovikon.pdfIn PDF document text
    • https://kukuwusak.weebly.com/uploads/1/3/1/3/131379738/9e4e75.pdfIn PDF document text
    • http://tokio-2020.fun/kapojakuwogefikofomitekornqab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gijuvaginitawaz.epizy.com/22328594274.pdfIn PDF document text
    • https://s3.amazonaws.com/leributafa/65255832466.pdfIn PDF document text
    • http://vawojemi.epizy.com/destiny_2_black_armoury_forge_guide.pdfIn PDF document text
    • http://gamupuzif.epizy.com/bunting_template_design_ideas.pdfIn PDF document text
    • http://bupomejov.epizy.com/wazeg.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_off0000bbee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBEE 5356 bytes
SHA-256: 8dcb23ba4340c71b7724f5b41941aa7032c7d3baa3951bfe3a8725f918c36dfb
font_01_sfnt_off0000ce13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE13 10436 bytes
SHA-256: 0a33a39d4fea41658b9b545f20e51b96ddee0a4d7e0c6df98046a8f62cb36d63

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