Malicious PDF — malware analysis report

Static analysis result for SHA-256 98f5d1a68bee9126…

MALICIOUS

PDF

89.6 KB Created: 2021-03-31 06:26:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7d50b9be3b110e97024f177ae8b77c85 SHA-1: 11bab16eb339164158cbaacbdad7993d8acd33eb SHA-256: 98f5d1a68bee9126b41743fbb358759625235b4e8cfdc1133188a48340b2ce55
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one pointing to 'ponafet.ru/award?keyword=south+africa+home+plans+pdf', suggesting a phishing or SEO link farm tactic. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely distributed via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/award?keyword=south+africa+home+plans+pdf
    • https://static.s123-cdn-static.com/uploads/4486215/normal_5fc8c77abbd10.pdf
    • https://static.s123-cdn-static.com/uploads/4369329/normal_5fe526ed19331.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/nunakixuma/42730082685.pdf
    • https://uploads.strikinglycdn.com/files/33aa5d2a-ee20-49d5-94b9-f22c2562cb43/what_does_diagnostic_code_p0300_mean.pdf
    • https://s3.amazonaws.com/wavunot/carrier_aircon_instruction_manual.pdf
    • https://uploads.strikinglycdn.com/files/2349c7fc-c650-43c8-a22c-c56dbbd092eb/what_are_the_best_strengths_in_strengthsfinder.pdf
    • https://ce322291-b3da-4cc2-ae0f-523e25daec44.filesusr.com/ugd/4530da_03d9944893a8451bb07c11db670dbc9e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/93808b2c-bddd-4bf4-92e9-a479cfd7af7c/classical_guitar_shed_bach.pdf
    • https://uploads.strikinglycdn.com/files/aa78e47c-1593-4827-bdf1-6ee325685c47/the_magicians_book_vs_show_reddit.pdf
    • https://uploads.strikinglycdn.com/files/013697a3-8fc1-458e-8211-0bb56b29dea6/who_do_i_call_to_repair_my_oven.pdf
    • https://uploads.strikinglycdn.com/files/f12290e7-eaa6-44b2-81dd-4a6398761aaa/61254177422.pdf
    • https://b5d51143-f34a-4a4f-9265-6917490cb775.filesusr.com/ugd/9f69bd_58ba480e3b734eae9086415a72c19dce.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f2a36165-e1ce-423f-bd3b-46a64720e172/what_is_junie_b_jones_middle_name.pdf
    • https://uploads.strikinglycdn.com/files/73800232-bf2b-431d-8aa1-6118d6b16342/24657922898.pdf
    • https://uploads.strikinglycdn.com/files/cd6a3f96-6f95-4a71-8837-971c92997236/norman_s._nise_control_systems_engineering_8th_edition.pdf
    • https://s3.amazonaws.com/nafibanefexex/wemifarazam.pdf
    • https://uploads.strikinglycdn.com/files/85710d78-1d48-4f4e-966e-1c926356fcff/xoluweboxodafarolid.pdf
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000110f8.bin
950338776fb427934c83c0d892d7210452fab350b1f2ac7fb2b2114700960a87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110F8 5380 bytes
font_01_sfnt_off00012313.bin
593095d68f7ba9828ec5b06c2baff42c541e64651e9c9b28f32f279b0306bfca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12313 11512 bytes
font_02_sfnt_off0001496d.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1496D 4324 bytes

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