Malicious PDF — malware analysis report

Static analysis result for SHA-256 931ddfcfda6427d0…

MALICIOUS

PDF

74.6 KB Created: 2021-03-27 11:06:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 2e95c0d829f3d5575698acdda9f39a0f SHA-1: 10645b5c3b5f7eec125017ea689bb5bf1d50817a SHA-256: 931ddfcfda6427d04f8ab05b01d6492d6f832723e87cee2ec389da4019cd82c2
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous external URLs, with a primary URL pointing to 'jottigo.ru'. This suggests the document is designed to redirect users to potentially harmful websites, possibly for phishing or malware distribution. No scripts were extracted, but the PDF structure and embedded URLs strongly indicate a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://jottigo.ru/wix?keyword=what+does+the+monkey%2527s+paw+symbolize PDF link annotation
    • http://uptodate.site/wapelugezeresususifukudizulobl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484356/normal_6045e9e30a1e5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369784/normal_5fca80719033d.pdfIn PDF document text
    • http://xomofaki.getenjoyment.net/broadcast_media_history.pdfIn PDF document text
    • http://tatuxuvoziparu.mywebcommunity.org/dual_beam_cathode_ray_oscilloscope.pdfIn PDF document text
    • http://wgathering.org/65913423851wka9o.pdfIn PDF document text
    • http://nuwetiveguvo.mypressonline.com/american_gods_cast_leprechaun.pdfIn PDF document text
    • http://piwulag.sportsontheweb.net/american_superpower_checks.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/40093c95-41c4-4b59-8995-7cecf84a9aff/53546549570.pdfIn PDF document text
    • https://14579757-8399-40ae-9aa0-1c510f02119b.filesusr.com/ugd/5613ee_b18e8e0bca0d46d0a7afcbb27045b58e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc42dbf6-cfe7-4e74-ada3-0a1d5615e46a/makejewafosizegowusojipi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f122a846-4139-4d46-a35b-97eb9301d41d/samsung_dishwasher_dw80j3020us_parts_list.pdfIn PDF document text
    • http://mukanebesiva.atwebpages.com/58453654809.pdfIn PDF document text
    • https://626fb5af-1d67-41cb-86ce-204163677ff0.filesusr.com/ugd/9d869b_4a84d2953333415799f820e1fcf0f7bc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/47c97b9d-d381-4e31-a0fd-a2879796e9f2/vukubajizuzibovixip.pdfIn PDF document text
    • https://810dce77-56ab-4324-823a-3549757f4eab.filesusr.com/ugd/1fad07_1c1a415cc78846ee8b9c7e6668a1ee8b.pdf?index=trueIn PDF document text
    • https://50037ee0-0691-4a53-bdc2-b2f8f795cfa6.filesusr.com/ugd/b41a9a_23721636ea22401989617d44f49e994b.pdf?index=trueIn PDF document text
    • https://972af30b-04c2-4618-b911-83ba0b7fef9e.filesusr.com/ugd/84a5c6_4f7ffbc424e940ac81f74360856d9dec.pdf?index=trueIn 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_off0000e54c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54C 5596 bytes
SHA-256: 27e1d800841bc6dacd6638621a30e8b89bcfae75a7020de2132943190fc1b342
font_01_sfnt_off0000f857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF857 10972 bytes
SHA-256: d9af3ebeece5b12dccd76b6317230c6b512d3bd60f577b41457458d767162d24

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