Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e51167f0d2c2f6e…

MALICIOUS

PDF

106.4 KB Created: 2021-04-24 15:00:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4fe5ccdd2b547beef68f9d05a6c4dab3 SHA-1: 124c9562bfd8b56815d3cfc639fe0d8f68b3f967 SHA-256: 1e51167f0d2c2f6e4eae4c8c7d67390b0d040c6615d3d75343149e38e1350024
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://botokaw.ru/strik?utm_term=are+all+midland+walkie+talkies+compatible PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450516/normal_604ffae7131d2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410211/normal_5fdfacc11babd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402486/normal_5feefc9286207.pdfIn PDF document text
    • http://gomigapujasep.sportsontheweb.net/tomunakasofu.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://uploads.strikinglycdn.com/files/9d098089-1b09-4a4e-9c91-2f16f704c847/jilof.pdfIn PDF document text
    • http://puvusevakap.epizy.com/wegebumi.pdfIn PDF document text
    • https://11ab4cf5-156d-4417-99e9-5039b2a7eb5f.filesusr.com/ugd/82d61e_89532fde5b04496791d259c40db88d51.pdf?index=trueIn PDF document text
    • https://9e4d96d7-92f1-4145-9aac-d1976e75dfe6.filesusr.com/ugd/49a98b_08baacc5f64e45659f3a34529acd14b4.pdf?index=trueIn PDF document text
    • http://wetepizibora.rf.gd/data_structures_and_algorithms_in_c_adam_drozdek_4th_edition_solution_manual.pdfIn PDF document text
    • https://d6477b75-8e4d-4453-8bbc-a86a6009e57c.filesusr.com/ugd/261d41_5529aa1643bc4b7297686a4ea8c6f37e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/97494b6f-972d-41ea-872f-821821642e69/kumamalo.pdfIn PDF document text
    • https://89f68ddc-9f98-4e60-8afa-3e0ca6603e9e.filesusr.com/ugd/4725f1_7571bd4b9d4248d2a46e5f7705fbc3e3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e80d474f-790b-4da3-851d-04f7b9e7b675/82178410895.pdfIn PDF document text
    • https://17851959-1482-4b49-8222-7b7b0c628459.filesusr.com/ugd/3cb679_f1ab42ef3390494491cbae7838cf60ec.pdf?index=trueIn PDF document text
    • https://97d49ff2-d914-4ae4-8ac8-5e5cf5f77cad.filesusr.com/ugd/6350c7_a0943757121e4d199cba0acbf5544fab.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7924424-5277-4f93-afda-ab61a6c52557/musuvoz.pdfIn PDF document text
    • http://bobixupeto.myartsonline.com/96196471523.pdfIn PDF document text
    • http://vefibuvusesusu.rf.gd/oxford_english_english_malayalam_dictionary.pdfIn PDF document text
    • https://aa84fbb7-d3ea-4675-94d1-3a2d808898f4.filesusr.com/ugd/661a84_1669f9d50cfd4989b3166bb24ff4965e.pdf?index=trueIn PDF document text
    • https://d8d691c7-cf48-432b-bece-a54604b57851.filesusr.com/ugd/1e3a4b_9530644dd23845eab74ae1bcc0b96910.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/53f6934e-2759-43eb-bedf-c760d7f58b69/shimano_r2000_spinning_reel_manual.pdfIn PDF document text
    • http://zofewodugap.rf.gd/kisaxuroralipur.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000153b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153B9 5292 bytes
SHA-256: f7d7ae748e24136db9d353078cf46039a1e696540276fd6965d61f907b79c4fe
font_01_sfnt_off0001659e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1659E 11896 bytes
SHA-256: 7843fec628a04c4fe8341c15c64c2c0148ce8e36630b72fb36e3d9aa3194bf39
font_02_sfnt_off00018dfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18DFB 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378