Malicious PDF — malware analysis report

Static analysis result for SHA-256 095b76f7815b3817…

MALICIOUS

PDF

128.4 KB Created: 2021-04-06 04:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 1ba082ce2a6ec6dc1d4b3b52f4e16134 SHA-1: b0ab02abbbd2866e816b150b657b47bf579dc3bd SHA-256: 095b76f7815b3817f632b4453af587f16a6a125db9ebc63f3d5b09ae6e800477
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=lg+g+vista+verizon+prepaid In PDF document text
    • https://cdn.sqhk.co/givifevulo/gjegege/fijuzidiredu.pdfIn PDF document text
    • http://parovosi.mygamesonline.org/44091988887.pdfIn PDF document text
    • https://cdn.sqhk.co/moviferu/IjahfIw/nuruniwuwiwedagevuli.pdfIn PDF document text
    • http://tejasatobes.medianewsonline.com/23084232582.pdfIn PDF document text
    • http://xajabuzowa.scienceontheweb.net/liberal_arts_math_practice_test.pdfIn PDF document text
    • https://cdn.sqhk.co/geroterunetu/ghLagh7/small_chickens_with_feathers_on_their_feet.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/d8aafc66-38f9-42bd-9860-caf1bd42524d/2015_jayco_redhawk_29xk_owners_manual.pdfIn PDF document text
    • https://329f26c8-0235-4118-8622-173d264d9cf1.filesusr.com/ugd/221f3a_5b8fc7dfa5934cd4aaa200a5a44293db.pdf?index=trueIn PDF document text
    • https://469ee322-798e-4c1d-9571-af6764901f97.filesusr.com/ugd/57169b_4bf5f9fcc04e4bad83abac6d76490460.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xixonu/97720068267.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/pogudabikizivolakunivu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f97fa83d-1afb-4fca-a233-869e4df69612/focus_daniel_goleman_recenzie.pdfIn PDF document text
    • https://6b2d4799-12fc-456d-8881-596234ac9a0a.filesusr.com/ugd/ae8ff6_f0fb11c0993b406699ab5c0d39fb8e38.pdf?index=trueIn PDF document text
    • https://3682d434-6e27-4ac8-9ac2-d3ec24fa429c.filesusr.com/ugd/9b5f63_4a8ce14d1b2f48b09c34c0fd940552a0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jarawaxanivu/mupogowitobumixaxumer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a7c9e09-7203-46b3-91c5-6ce489e01591/60062428.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1524e1f2-99ad-4900-9432-5f1e0f3cd245/bumolojetesupujiseruwatit.pdfIn PDF document text
    • https://s3.amazonaws.com/gasodamuza/dukibujurafe.pdfIn PDF document text
    • https://2daccc73-8708-4113-a26a-4f38906335d9.filesusr.com/ugd/f65175_2c222166a64a46ebafd47950077157ed.pdf?index=trueIn PDF document text
    • https://1c896d37-30d1-4b4d-9537-98f963aae812.filesusr.com/ugd/865d50_1d82dfad5bb94a43b4a93d3569b5166d.pdf?index=trueIn PDF document text
    • http://fogokenum.onlinewebshop.net/wahl_clippers_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/351e92c0-2902-4d6e-84bc-797a5bb9d8eb/40883961637.pdfIn PDF document text
    • http://rotufixijisadi.onlinewebshop.net/spanish_family_tree.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a4aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A4AA 5148 bytes
SHA-256: 111a75a9b31874a6e49c496730fa235ce0077eef68ad24587b9e6b7c035a3e6a
font_01_sfnt_off0001b653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B653 12092 bytes
SHA-256: 658433762ab34ea3fdd7ff5970b2513baadbfa84fd853601d3cf0b2cc61f7caa
font_02_sfnt_off0001df5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DF5B 16076 bytes
SHA-256: 75bbd65b209dd63d03d218c8a080e02e74e48388e264bced155518a984d3e53f