Malicious PDF — malware analysis report

Static analysis result for SHA-256 19b1cec9ba0eff05…

MALICIOUS

PDF

71.3 KB Created: 2021-03-24 22:17:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9e4a0dda0e9d6204f95be772b6c8cfc1 SHA-1: 9d0478ea612e23b74326337e6e1de1e0f8a7f774 SHA-256: 19b1cec9ba0eff05d683dfaa9804476d28e1acc79d8e16f955457736fa24c1cd
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files hosted on free web services, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially malicious content, possibly involving a JavaScript exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/strik?utm_term=ti+nspire+cx+vs+cx+ii-t
    • https://paxexituva.weebly.com/uploads/1/3/5/3/135332474/wixajimixaxil_xexixarivelovi.pdf
    • http://towufato.mywebcommunity.org/22737907549.pdf
    • http://bixuvetojotenes.22web.org/the_maze_runner_book_series_pages.pdf
    • https://wisolowiguwo.weebly.com/uploads/1/3/4/6/134630140/1150339.pdf
    • https://zoxaminajoge.weebly.com/uploads/1/3/1/6/131637873/jodubitogowisu.pdf
    • https://rerutafedebe.weebly.com/uploads/1/3/2/8/132815298/rilonula.pdf
    • https://cdn-cms.f-static.net/uploads/4414848/normal_6047d450cfbd0.pdf
    • https://cdn-cms.f-static.net/uploads/4391015/normal_6046d06b77670.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2a4c341d-9af7-4f89-b48a-1b926ad6ced7.filesusr.com/ugd/dd6616_63729a2a200b42fb81041c4a5b75a56d.pdf?index=true
    • https://s3.amazonaws.com/kaxukok/68837499017.pdf
    • https://s3.amazonaws.com/wefemabeni/abc_13_weather_app.pdf
    • http://sulorowanutabu.atwebpages.com/jemepamavoz.pdf
    • https://s3.amazonaws.com/gedexim/destiny_2_guided_games_last_wish.pdf
    • https://367e539a-c541-4439-991c-4bf2bef2aa7a.filesusr.com/ugd/77d535_e43bbe5d46914eb1a58e05cde79e4966.pdf?index=true
    • https://c06d174a-caca-4ab2-b5a0-4525cd3135d4.filesusr.com/ugd/856cea_21668b8d6690478ca7c0c2c4601e2f1f.pdf?index=true
    • http://jumerajoge.epizy.com/what_can_lacto_vegetarians_not_eat.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcc1.bin
84795a311b6b6e6a3140e82a53bb9105fd6bf3f2b509cf915195198725e3714a
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC1 4792 bytes
font_01_sfnt_off0000ed35.bin
56063953d44ad6504cb28c0b6a816cd651c21734c6562f81579cf8db5f1e7dee
pdf-font-stream PDF embedded font (sfnt) at offset 0xED35 10400 bytes