Malicious PDF — malware analysis report

Static analysis result for SHA-256 645ad1f6b7561286…

MALICIOUS

PDF

71.8 KB Created: 2021-03-23 07:40:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 7b1922d824459d08ec86b741962cb35f SHA-1: 13e969a5581ba76c1aea8d80057c5d6fb34e41fb SHA-256: 645ad1f6b75612864d8f1122e653c1b50aa028788e77bfbe930c2a4a3344d9da
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'Hot wheels race off mod apk', suggesting a lure to a potentially malicious download or phishing site. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/wix?keyword=hot+wheels+race+off+mod+apk+all+cars+unlocked In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367656/normal_604664d96707a.pdfIn PDF document text
    • http://bullbananavannaone.xyz/16608175162rzbdj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462696/normal_5fdace25e3961.pdfIn PDF document text
    • http://helplnstagramcontact5087423.com/roadmaster_granite_peak_24_specsiulxy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473622/normal_5fd677abe2b7c.pdfIn PDF document text
    • http://subonus.ru/80869028046dhf90.pdfIn PDF document text
    • http://mir23.xyz/joker_2019_trailerxiw9r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367624/normal_60184aea7dda5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mokupimi.epizy.com/8180551751.pdfIn PDF document text
    • https://95c758d6-fd33-43c6-b5d0-f1f55e07e946.filesusr.com/ugd/cb0188_b7c15ef021ee4156a231bfb014d766ad.pdf?index=trueIn PDF document text
    • http://lavodusepigixu.rf.gd/causes_of_mental_illness.pdfIn PDF document text
    • https://02274cc9-8b57-4441-be19-e46c089ec46b.filesusr.com/ugd/f11b8f_548d06c00b234284b2d87de1765eb4e0.pdf?index=trueIn PDF document text
    • https://6b54b0b2-91db-43cc-88c8-bbc4f7e20b37.filesusr.com/ugd/a773aa_3b2dae167e5a4eaeb85352026c0eb8c0.pdf?index=trueIn PDF document text
    • https://0b21792c-a699-4cf4-8833-5910c6ad58af.filesusr.com/ugd/b0b521_b0c78ae0210f4678a97038d6987785d6.pdf?index=trueIn PDF document text
    • http://luwemazezabubat.rf.gd/telugu_movies_free_jio_rockers.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_off0000d914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD914 5512 bytes
SHA-256: fc59c0cbc74a0c0679fc1bbc098c8e6136665f4bd995e1005d9b4a4864d831f3
font_01_sfnt_off0000ebb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB9 11248 bytes
SHA-256: 3fa72336405d84ad20df4614aa519bff393dba60ca4403fe9c4b0ca5081939d1

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