Malicious PDF — malware analysis report

Static analysis result for SHA-256 246d1fafaa4d33c1…

MALICIOUS

PDF

101.6 KB Created: 2021-04-21 23:42:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d3662a0dbfd7dbb5e0433d7cf7b6c73 SHA-1: d05bd38a0d6829b48d84e7bfe4cb15dab0fcfe03 SHA-256: 246d1fafaa4d33c139248b95865e3b7810ed1a008f55e7e7e3afba8a4a96d826
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan and an ML classifier indicating high maliciousness. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, appears to be a lure related to book chapter summaries, designed to trick users into visiting malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://lozipotod.ru/strik?utm_term=resumen+del+capitulo+5+y+6+de+etica+para+amador
    • https://wiwotejezewol.weebly.com/uploads/1/3/4/6/134691264/b6a6c620.pdf
    • https://static.s123-cdn-static.com/uploads/4407724/normal_600802545db38.pdf
    • https://cdn-cms.f-static.net/uploads/4379854/normal_60530536c05d3.pdf
    • https://cdn.sqhk.co/feripamapuv/jhhhUX6/line_colour_3d_game_online.pdf
    • https://cdn-cms.f-static.net/uploads/4477635/normal_6057eac155dae.pdf
    • https://cdn.sqhk.co/fowifabibu/UHdhcwy/ditepeten.pdf
    • https://mekuzawejonoma.weebly.com/uploads/1/3/1/6/131606345/2950610.pdf
    • https://ralirepiputup.weebly.com/uploads/1/3/4/8/134852471/a77986.pdf
    • https://cdn-cms.f-static.net/uploads/4392656/normal_601d1676cb2da.pdf
    • https://cdn.sqhk.co/numiwuzuwix/ji5Fgf5/kixufesenun.pdf
    • https://cdn-cms.f-static.net/uploads/4383912/normal_60148ddbe9221.pdf
    • https://cdn.sqhk.co/bifoligi/4hcgejc/night_agent_i_m_the_savior_facebook.pdf
    • https://tamoniwezetiro.weebly.com/uploads/1/3/5/9/135961995/51c575.pdf
    • https://cdn.sqhk.co/ganuniwiku/gg4hgha/mekudutuwob.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://3176e400-c268-4dc0-8d69-08eae86937f8.filesusr.com/ugd/ea2f88_8d4c425d4fec4bada48d35ff7f0910a5.pdf?index=true
    • https://0f8fedcd-12c0-4678-86f8-e2bff7269121.filesusr.com/ugd/70e7d4_aec415797a4a4fe080f40a2a931e17c1.pdf?index=true
    • https://abee6ad4-cf47-459a-954e-22b9b9bb30ad.filesusr.com/ugd/4bdc6d_97099ca1568948a08e8cd7832d72911c.pdf?index=true
    • https://6acf0ca1-aa41-4771-8b91-54baff69ee7f.filesusr.com/ugd/7d1dc9_244d09a2bb894e46ad37f3bca974ef55.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_off00014ccf.bin
5c989e01d15b00d32ec188edeeb027c94549bbdbb6c3cfd644b0ffdff9091a6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14CCF 5604 bytes
font_01_sfnt_off00015fd8.bin
7905dd00431123ded78a0df847aa65b96536d291af397a248f345995d482e2a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15FD8 12064 bytes

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