Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a329415243bd117…

MALICIOUS

PDF

95.0 KB Created: 2021-05-14 09:46:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e737128de8d65926405a6d9907de2890 SHA-1: 7a0cd95aeef66fb94ba93b3e1621f77123dd2470 SHA-256: 1a329415243bd1179611c4648a69a2ee998e7425db73219c70f7a9d15e055c4b
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 critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous embedded URLs, many pointing to link farms and disposable domains, suggesting a phishing or redirection scheme. The presence of external URIs and the overall structure strongly indicate an attempt to direct users to potentially harmful websites.

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://nipisod.ru/strik?utm_term=how+to+make+a+red+lens+for+spotlight
    • https://cdn-cms.f-static.net/uploads/4376375/normal_603a8b8887de8.pdf
    • http://jepisafidezegun.scienceontheweb.net/indomethacin_in_pregnancy.pdf
    • https://cdn-cms.f-static.net/uploads/4485301/normal_602e7388727f2.pdf
    • https://cdn-cms.f-static.net/uploads/4472763/normal_5fd09db98edc8.pdf
    • https://cdn-cms.f-static.net/uploads/4420917/normal_60412b176452f.pdf
    • http://taxevidel.medianewsonline.com/what_is_a_passing_edtpa_score_in_ny.pdf
    • http://watulexop.iblogger.org/formation_a_distance_adjoint_administratif_territorial.pdf
    • https://static.s123-cdn-static.com/uploads/4496372/normal_6004e0e8e2607.pdf
    • http://sajogol.iblogger.org/benzodiazepnicos_2020.pdf
    • http://magexaxajatadog.getenjoyment.net/circuito_bobina_de_tesla.pdf
    • http://wexebigusokata.iblogger.org/bronkitis_idai.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fegidil.rf.gd/aacomas_schools.pdf
    • https://s3.amazonaws.com/zevutebulaworel/linux_for_beginners_download.pdf
    • http://mejoderewe.epizy.com/55509487190.pdf
    • http://kezasifofajimo.rf.gd/zagufalofuralit.pdf
    • https://s3.amazonaws.com/xewamejixolefaj/6668344371.pdf
    • http://mafakizukizunof.epizy.com/xazazusirapatetakepit.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_off0001369a.bin
84ab2dfe9178883f02700ce48cce460a42f0dffadc6bfe300002bd2b9e3bf972		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1369A 5572 bytes
font_01_sfnt_off00014972.bin
9366ac65549f1b56f5f9cf9b05754b7ae1cfddfa8e5adfd9817d6de81601c07d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14972 10928 bytes

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