Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7bf33e2b03c3500…

MALICIOUS

PDF

81.5 KB Created: 2021-04-05 18:00:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4db64e432874ca20d62d1ace2039cc5 SHA-1: 9a82800c9431346b61ec75c546af3c30159ba751 SHA-256: d7bf33e2b03c350053a66dc5d08eaf682a054bbd1f9d5a21b7166c973f31ff02
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious content. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://zajinet.ru/strik?utm_term=oxford+house+aylesbury+rent
    • http://ketousa.site/rodibofem4ntn.pdf
    • http://itdiscounts.pro/how_can_i_become_a_system_administratorxiia0.pdf
    • http://dezlice.ru/sivifaradfzjh9.pdf
    • http://wide-do.top/91005530262m83xv.pdf
    • https://cdn.sqhk.co/dorejewibiz/rvPigji/among_us_coloring_book.pdf
    • https://cdn-cms.f-static.net/uploads/4462059/normal_60650c8e2affc.pdf
    • http://verenica.net/zawalisevarikixelxp6uj.pdf
    • http://jumbochecker.com/wisesojasoxodititepigxtmjs.pdf
    • http://fb-ig-violation.com/intussusception_nice_guidelines0fa9t.pdf
    • http://stakingyfi.com/200845279777d97i.pdf
    • https://cdn.sqhk.co/kakapoxavu/jcQihag/50101347880.pdf
    • http://freshmind.net/cooks_essentials_2qt_digital_stainless_steel_pressure_cookera72k6.pdf
    • https://cdn.sqhk.co/farukisinu/eRgdUjh/tvd_character_quiz_sporcle.pdf
    • https://cdn-cms.f-static.net/uploads/4471474/normal_60480b87b2cf2.pdf
    • http://tesar-krd.ru/xaloliduxogajeloxewj9uk5.pdf
    • https://static.s123-cdn-static.com/uploads/4459188/normal_5fdd4a8f0ed42.pdf
    • http://qiwi-wallet.online/how_to_make_an_outline_for_an_expository_essayj27yg.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b354d503-40d1-4c97-84b4-bc0b16c12f35.filesusr.com/ugd/8c7d07_889ef6538da5441eb9fa48791b49f6b3.pdf?index=true
    • https://178c1879-e916-404b-9861-a2431bd0f83a.filesusr.com/ugd/1aace6_4a33539998b84f4581a73a938119c52b.pdf?index=true
    • https://3f5765b5-411c-4b28-96d1-a1e3b219bcee.filesusr.com/ugd/ca847e_7e3d2639283a42609457b9a140238dd1.pdf?index=true
    • 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_off00010139.bin
061bc08d67572453746d741aff1170b538fc85a7d30516b18145e6065aef79d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10139 5332 bytes
font_01_sfnt_off0001135f.bin
59218471151bb6209303895a6e30778001a130b5bdc8472e1c3b4ded91a5f51f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1135F 10920 bytes

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