Malicious PDF — malware analysis report

Static analysis result for SHA-256 33c4fc66fe4bf52d…

MALICIOUS

PDF

85.8 KB Created: 2021-04-22 20:12:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: b8c4b771acbce4783a1c8dc2c4aa89c3 SHA-1: 213dc1e8919626dc4286918da56c44c57d772779 SHA-256: 33c4fc66fe4bf52de0ceae79db699831ba9a7e3d7231a17e3767f82eb5a2c999
126 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs, many hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the document's structure point towards an attempt to trick users into visiting malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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://ponafet.ru/strik?utm_term=wheel+horse+bourbon+rating PDF link annotation
    • https://ximinelinax.weebly.com/uploads/1/3/4/3/134313791/dagenaze_nujifaxapisalop.pdfIn PDF document text
    • http://rexuwoxaga.sportsontheweb.net/nidufigegulo.pdfIn PDF document text
    • https://mebedepubini.weebly.com/uploads/1/3/0/8/130813558/renuzezetitogetetu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493200/normal_606483da53c4a.pdfIn PDF document text
    • https://rudazijix.weebly.com/uploads/1/3/1/4/131453676/4cc2165e28d927.pdfIn PDF document text
    • https://fakokawiloduku.weebly.com/uploads/1/3/0/7/130775735/rovuzanozonivo_roxotixopojo.pdfIn PDF document text
    • https://radoduwew.weebly.com/uploads/1/3/4/3/134351920/telepujisamopa-lojenefaxi-pibavanowixugar-zetozebekire.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393033/normal_606e7136c2d26.pdfIn PDF document text
    • http://jigikujed.scienceontheweb.net/faganiputodutanowefoso.pdfIn PDF document text
    • http://mogisut.medianewsonline.com/85771226170.pdfIn PDF document text
    • http://mobufuwiwid.medianewsonline.com/jonumuz.pdfIn PDF document text
    • http://lamakexo.scienceontheweb.net/87237424322.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
    • http://fataragoreb.myartsonline.com/lotabe.pdfIn PDF document text
    • https://be1d055c-b83b-422e-9e68-1bf13cef350c.filesusr.com/ugd/5b1e3c_722b123ac59147ba944468f39ff2d857.pdf?index=trueIn PDF document text
    • https://50037ee0-0691-4a53-bdc2-b2f8f795cfa6.filesusr.com/ugd/b41a9a_d2763f591514407498e0384a8219ade3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gawabog/74016356243.pdfIn PDF document text
    • https://s3.amazonaws.com/paxunu/barricade_xl_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/tamil_new_movies_2019_full_movies.pdfIn PDF document text
    • http://novogizeboje.myartsonline.com/41703201972.pdfIn PDF document text
    • http://susabumo.atwebpages.com/what_is_curriculum_essay.pdfIn PDF document text
    • https://s3.amazonaws.com/tisegovofu/what_are_the_primary_benefits_from_investing_in_income_property.pdfIn PDF document text
    • https://s3.amazonaws.com/solonebosop/how_to_play_cyberpunk_2077_early_on_ps4_reddit.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_off0000ef1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1A 4984 bytes
SHA-256: 76867127a10829233b683a7f960638eb7c36c8e201a5fa64d2bed1d6a5844453
font_01_sfnt_off0001000d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000D 11252 bytes
SHA-256: 6b5897cf0b2ae5d31cb1eb1c758c49f0129b5b238bed3be89905a372862ce7a5
font_02_sfnt_off0001262a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1262A 16092 bytes
SHA-256: 39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67
font_03_sfnt_off00013af1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF1 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34