Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d38d3bdced0f701…

MALICIOUS

PDF

131.5 KB Created: 2021-05-08 11:05:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 11162bcf345255c66b073ff57a06b8b1 SHA-1: 2999af1bc7e061c30f618464e601d4bbcfed09da SHA-256: 2d38d3bdced0f701966d8fd59aba622599f29b392820060078c24ee4f89cd24c
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, characteristic of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs, such as https://mezovuduw.ru/strik, are likely used to redirect users to malicious content or further phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://mezovuduw.ru/strik?utm_term=why+did+they+need+the+gravity+equation+in+interstellar PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420222/normal_6038819d7e0c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384828/normal_600d43a049344.pdfIn PDF document text
    • https://rizomoxus.weebly.com/uploads/1/3/4/5/134589692/0599dfcb6b1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387711/normal_5fcb57314819a.pdfIn PDF document text
    • http://renijulemigato.iblogger.org/91419173435.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368492/normal_5fec46fee9b49.pdfIn PDF document text
    • https://cdn.sqhk.co/kisilusotuke/iegcbBi/79622275114.pdfIn PDF document text
    • http://xulenegutuwovi.iblogger.org/bmw_car_photos.pdfIn PDF document text
    • https://cdn.sqhk.co/mugapowejog/kicgiib/granny_s_house_multiplayer_horror_escapes_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/farafakilof/ehhBgjs/artificial_intelligence_penny_stocks_to_buy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494866/normal_5fcda66fa7ce2.pdfIn PDF document text
    • http://borutafag.66ghz.com/chimney_sheep_size_guide.pdfIn PDF document text
    • https://wosapinilesodiw.weebly.com/uploads/1/3/5/3/135347506/mopuvusutadenofa.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
    • https://878ee1be-828d-48b9-a24a-84283cf66a1c.filesusr.com/ugd/86936c_f2fc5c05207c4e6d8d649a6dcd694534.pdf?index=trueIn PDF document text
    • http://mujuvuxi.epizy.com/39872583719.pdfIn PDF document text
    • http://megavidovafivo.epizy.com/how_to_reset_hp_ink_cartridge.pdfIn PDF document text
    • https://0dea665b-aaaa-42f3-a52c-f86f0fd1efa2.filesusr.com/ugd/8b9728_bc1ce53332764318bc10d09fea7fad42.pdf?index=trueIn PDF document text
    • http://tupudenijusab.rf.gd/how_to_backup_android_to_gmail.pdfIn PDF document text
    • https://cceb078e-1df6-42b0-9e12-359f30e42f1d.filesusr.com/ugd/e8506d_7fa7d91571dc44c88ec816e72607b4c3.pdf?index=trueIn PDF document text
    • https://3d73ec66-e24e-4607-99a5-aa3c333c10ea.filesusr.com/ugd/a96454_e3de8d5105074f4cb9dcf4a7c9bdfefc.pdf?index=trueIn PDF document text
    • https://1eba3b37-3dce-45e8-aa15-e51a58efc0fe.filesusr.com/ugd/89e37c_6ca534774d7f411699632c55230b1e78.pdf?index=trueIn PDF document text
    • http://vewamade.rf.gd/class_attendance_register_template.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001979f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1979F 5268 bytes
SHA-256: e6b9a3c4b3f10b7bead934169c533f581b7776a2f88baaac4f7a4bc2287d12ed
font_01_sfnt_off0001a985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A985 14736 bytes
SHA-256: 165731f322ff01019e90faf9bd4c2dbb8b876e1f6fd839edbbc6db164221c231
font_02_sfnt_off0001dade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DADE 16484 bytes
SHA-256: 511eb175d1a30ee01622c02e1150217ba0e64b2e99e7556a7505854b7ec87408
font_03_sfnt_off0001f131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F131 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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