Malicious PDF — malware analysis report

Static analysis result for SHA-256 262a25c653ac2bf9…

MALICIOUS

PDF

75.8 KB Created: 2021-05-16 15:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 6eba85c8ccb74b31fe2ba17fd83f753e SHA-1: 297be9f19a0af5f511a88da34a6cf6e1e8e17c4c SHA-256: 262a25c653ac2bf9ef355d4ca407402518392c49e11d23524cb51f0a5ee050d7
126 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous embedded URLs pointing to link farms on disposable hosting, a common tactic for phishing or distributing further malware. The presence of external URIs and the link farm heuristic suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://botokaw.ru/strik?utm_term=how+to+make+chicken+broth+slow+cooker PDF link annotation
    • https://cdn.sqhk.co/fuxivuxovu/jaJijVs/detective_conan_movie_2019_gsc.pdfIn PDF document text
    • https://cdn.sqhk.co/gufemazibafi/4hegdjf/sufee_admin_school_and_coaching_management_app.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421983/normal_600724f2cd8c0.pdfIn PDF document text
    • https://cdn.sqhk.co/semejegofip/injeojd/pejowu.pdfIn PDF document text
    • http://fastnoutservice.ru/what_does_it_mean_if_your_smoke_detector_flashes_redocmuq.pdfIn PDF document text
    • http://ueuniti.xyz/fraction_division_word_problems_6th_grade9tvfl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417423/normal_60253580d7571.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417824/normal_6004e88c6d25a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419633/normal_601b6787eeee2.pdfIn PDF document text
    • http://idealslim-ordina.site/ligafemojibijilebodo02p5y.pdfIn PDF document text
    • http://detonicro.website/love_song_in_winter_piano_sheet_musicnzox0.pdfIn PDF document text
    • https://cdn.sqhk.co/zafilivopupu/eidccih/juzonuxuxikonadaxoxog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417543/normal_605a1ae45015f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472486/normal_5fdb76c23441d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425224/normal_5ff8a8ce089bb.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/76a726ef-56c2-4b02-98d0-a20e5c59c6f0/spectrum_reading_grade_3_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64acec6a-3207-4e31-a73b-bd76bba6fcfa/lunan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a44d7216-68c0-46e7-8772-42d1a3513bb8/what_are_the_aa_traditions.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_off0000eb26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB26 5296 bytes
SHA-256: e3d0d38db4924da38e878181410b731a2215d48a921904531d3eaf454e8a254b
font_01_sfnt_off0000fd07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD07 10832 bytes
SHA-256: c5bd1bd8ba89dcba67a84d4aa3b9b6c7ed7ae1c85366a8afff2fee5d3884bb87

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