Malicious PDF — malware analysis report

Static analysis result for SHA-256 908470f8cbca9aae…

MALICIOUS

PDF

99.6 KB Created: 2021-02-22 01:13:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7b3d3a58acfb6f37cef90a31a24735cb SHA-1: 412e10a71c9c74a91b234feb4926f25b8298edfb SHA-256: 908470f8cbca9aae5bbd7572ce3b0c0488f1bca33debdcff6d289c41660f95d0
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is described as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful sites. The presence of embedded URLs further supports this, likely serving as part of a phishing or malware distribution scheme.

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
  • 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://maypoin.ru/123?utm_term=little+red+riding+hood+summary+story PDF link annotation
    • http://mosdendy.store/barrett_jackson_scottsdale_arizona_2020_resultstxp7j.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476126/normal_5fe11b73ea0ea.pdfIn PDF document text
    • http://sarkife.site/micrologic_6.0vmbpm.pdfIn PDF document text
    • http://fredo.run/5262190554709ece.pdfIn PDF document text
    • https://cdn.sqhk.co/totafeta/A6hiMhV/tikubupefimib.pdfIn PDF document text
    • https://cdn.sqhk.co/litigoruf/2jhFphd/pagiledodonaloxewekires.pdfIn PDF document text
    • http://kreativoblako.com/848637375734ll7q.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493867/normal_5fe2780db176c.pdfIn PDF document text
    • http://kieverts.xyz/kopebovozojisuxakanol2fa8.pdfIn PDF document text
    • http://doordash.link/16630737874f3fnv.pdfIn PDF document text
    • https://cdn.sqhk.co/gurudulep/hgjjg36/k_pop_band_bts_dynamite.pdfIn PDF document text
    • http://lorebip.22web.org/xiketijofok.pdfIn PDF document text
    • http://zenarajare.22web.org/advanced_excel_course_content.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376852/normal_5fe16bfbdbb77.pdfIn PDF document text
    • http://gosologesegob.iblogger.org/godutanubafopoturam.pdfIn PDF document text
    • https://cdn.sqhk.co/zepagaro/4I157ie/free_fonts_for_cricut_maker.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wovoruvuluriba.epizy.com/zaxudedimox.pdfIn PDF document text
    • http://wajiletum.epizy.com/lazoxovazalipugitokukuxut.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_off000147b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147B3 5280 bytes
SHA-256: acef2152ff5c01f307bc5eafc38db26a4e07d6de411a2796e7131ddea3c24eaa
font_01_sfnt_off00015981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15981 11960 bytes
SHA-256: 66470d5cd0cd092a13ffb8251a020b7bc32134a002ab907fa3fdb13189e8dc05

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