Malicious PDF — malware analysis report

Static analysis result for SHA-256 99bf7e2dbb39c136…

MALICIOUS

PDF

73.3 KB Created: 2021-04-04 18:06:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 20f81ac8ff99387ad1e05f08e9630031 SHA-1: 0061d5addd29a745f0495c9058cec6efbdb55d60 SHA-256: 99bf7e2dbb39c13679bed371cecfc298b483e942a2d018d7e6bcfded4e46bb07
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

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://ponafet.ru/wix?keyword=algebra+1+chapter+7+answers PDF link annotation
    • https://cdn.sqhk.co/vapiwibisa/gCgefjj/xibetiwe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445531/normal_5ffecf4fb1230.pdfIn PDF document text
    • http://formblckr1.xyz/4413939479jm90r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405660/normal_602f4a7142b0f.pdfIn PDF document text
    • http://bapitafi.22web.org/periodic_table_with_atomic_mass_and_atomic_number.pdfIn PDF document text
    • http://belkwigs.com/what_are_pink_diamonds_worthqok9d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501229/normal_5fe00dfb00452.pdfIn PDF document text
    • http://tadezutalowebe.22web.org/messenger_for_android_old_version.pdfIn PDF document text
    • https://cdn.sqhk.co/joxusozomilo/FOhjVid/subtraction_worksheets_ks2.pdfIn PDF document text
    • http://megatorg.ru/rekasorodasoxatuldn6en.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • http://moscowflowers.online/kebiruxuzulefu85gsg.pdfIn PDF document text
    • http://dilurijarejo.22web.org/darude_sandstorm_trumpet_sheet_music.pdfIn PDF document text
    • https://cdn.sqhk.co/tuponapalab/igiif8q/goldleaf_switch_guide.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/cec0625e-cb55-41ba-8876-458999fda886/7940904118.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45429f13-d2fe-4df6-98dd-914d2bd3c9c2/briggs_and_stratton_3000_psi_pressure_washer_carburetor.pdfIn PDF document text
    • http://wikilupari.epizy.com/60700567044.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c388af5e-ed3d-42d0-b439-a8eaaeefe99c/33897971254.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3e189ae-962c-4cbc-a508-cb0053e63df8/17116125618.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_off0000df8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8F 5548 bytes
SHA-256: b9d26e67e9745c25d7d5df74dc9f4070a6f0280d215d8a282f0d621f5b5c49a7
font_01_sfnt_off0000f285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF285 10900 bytes
SHA-256: 8f10715720aba87a961cc5496553c3d48bc0c232efbe3feb57d0d292a86bb79a

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