Malicious PDF — malware analysis report

Static analysis result for SHA-256 8007650bf1f741d2…

MALICIOUS

PDF

83.2 KB Created: 2021-04-20 04:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 74b0e17d7b0ee4c4d15fa1877479313b SHA-1: ef6f9fe44da4ff4dfcd9c5b6fcc98b5c657d6946 SHA-256: 8007650bf1f741d21065e1f46b8c1caeac68c73c6785e1ef58ad2902a5e9e912
186 Risk Score

Malware Insights

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

This PDF document was identified as malicious by both ML classification and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, one of which is `https://seumenha.ru/strik?utm_term=how+to+search+google+images+with+a+picture`. The document's structure and the presence of many external links suggest it is designed to lead users to potentially harmful content or phishing sites, masquerading as helpful information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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 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/strik?utm_term=how+to+search+google+images+with+a+picture
    • https://static.s123-cdn-static.com/uploads/4491437/normal_60082768e4fc8.pdf
    • https://nezikuwetop.weebly.com/uploads/1/3/5/3/135346993/b17189480.pdf
    • https://losaburi.weebly.com/uploads/1/3/5/3/135322327/nonaligeputoga.pdf
    • https://cdn.sqhk.co/tawibonikigo/gj7Lij5/mario_maker_3ds_amiibo_how_to_use.pdf
    • https://cdn.sqhk.co/wedowetaso/YpU6Xih/retro_warehouse_penryn.pdf
    • https://fojanatixisi.weebly.com/uploads/1/3/4/2/134265346/vafezu_vobapibil_sijibug.pdf
    • http://gozipoxeget.iblogger.org/learn_applescript_the_comprehensive_guide_to_scripting.pdf
    • https://cdn.sqhk.co/kugefiruxat/idhgKpP/dexegepuxuzibogufiwasox.pdf
    • https://cdn-cms.f-static.net/uploads/4381294/normal_60461d87d040b.pdf
    • https://cdn-cms.f-static.net/uploads/4413454/normal_6035ae7318e0f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/da4064dc-7de4-4aa2-8288-00cc40d86053/how_to_treat_diabetes_2.pdf
    • https://8f6f9f04-f977-4239-955d-f6aecf2dd879.filesusr.com/ugd/81cd61_94a42e770c85442ba645fd6a3056a460.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c1174084-2ef7-4b7a-9bea-60ea1e943114/la_leccion_de_august_audiolibro_espaol.pdf
    • https://uploads.strikinglycdn.com/files/ff6331d2-3104-4e49-b1ac-b53929d1ec02/how_to_update_garmin_nuvi_gps_without_computer.pdf
    • http://diwekudajon.epizy.com/97287876514.pdf
    • http://ragipop.rf.gd/34308242229.pdf
    • https://19508648-7f28-415f-8121-b57715dc1465.filesusr.com/ugd/9734e7_ea9a035f2ab74062af9680a3c6fdd1d4.pdf?index=true
    • https://5f8b0e40-2141-4341-98ab-6145db4b8156.filesusr.com/ugd/2072cd_ca49ba536bd64694bb264776f0134976.pdf?index=true
    • https://f8b2de7a-6012-4721-b8f1-df5267d6bb95.filesusr.com/ugd/8ebb60_a14d89c36e2443b48cdd2e20bee9bc28.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f063.bin
38e18bf151dddb103852336598745f80b491e192ca2cd78ab03746895c8d20f7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF063 5400 bytes
font_01_sfnt_off000102a6.bin
3a6247d86cf663358e501fc2010e34b359a6071e86a09ab9eb89e03abec65629
pdf-font-stream PDF embedded font (sfnt) at offset 0x102A6 11180 bytes
font_02_sfnt_off000128ed.bin
c39953f0148d5f856d9856cf740d086a93c48ae39e3202c569b932315140d4a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x128ED 16416 bytes