Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdce20741d81fba4…

MALICIOUS

PDF

76.2 KB Created: 2021-03-17 14:25:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd24880df38142e91e30a7b159decaef SHA-1: 5fb76165af2557cb75a0f86c2e39233ce147399c SHA-256: fdce20741d81fba4aed69a8b69c5fcc0f004312fc632af902e29d5291795e974
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' pointing to numerous PDF files hosted on free domains. This suggests the PDF is part of a link farm or redirection scheme to distribute malicious content or phish for information. No scripts were extracted, but the presence of numerous external links is a strong indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/strik?utm_term=apple+airport+express+top+speed
    • http://idealslimitaly-ufficiale.site/xubewosaxijesijepekezeqcz6j.pdf
    • http://natur-green.fun/spur_gear_design_procedure2h4no.pdf
    • http://mifudubesesul.iblogger.org/73501335533.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://nosorozu.epizy.com/welotalegasawolasefuwa.pdf
    • https://4b4ea461-5266-411b-8735-d5290551f550.filesusr.com/ugd/7fedcf_ca75b30ee3eb450f96cce0e57a1bd0f7.pdf?index=true
    • http://vejawojifig.epizy.com/john_deere_gx345_price_list_ireland.pdf
    • http://walefofu.rf.gd/23945108904.pdf
    • http://felepav.epizy.com/barbra_streisand_albums_free.pdf
    • http://bupineweso.rf.gd/safety_siren_pro_series_3.pdf
    • https://s3.amazonaws.com/sirilagewuga/app_sharer_apk.pdf
    • http://najirukijo.rf.gd/ceftriaxona_vademecum.pdf
    • https://s3.amazonaws.com/dudujopixejikug/51477592321.pdf
    • https://s3.amazonaws.com/juvetaso/1022386414.pdf
    • https://s3.amazonaws.com/xokebore/superman_and_me_discussion_questions.pdf
    • http://lejaxofin.epizy.com/gilobevokuse.pdf
    • https://s3.amazonaws.com/gorajikunobixi/information_architecture_software_development.pdf
    • https://9042e326-c85f-44e6-b9b6-0c206471fdba.filesusr.com/ugd/0d2fda_26a0c005a4f64114b7eb7eba4f01161d.pdf?index=true
    • https://aee666f7-65d2-4416-8089-42e5bd85255d.filesusr.com/ugd/c4036c_af55c1f2cbcd4c2a8e866ad4b9d47722.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0d0.bin
4c0d5ba8162a009013573a033248751ffdc72150c806229d14451bd6b2538291		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D0 4692 bytes
font_01_sfnt_off0000f0d5.bin
bbfc00810f128cbd3f66c2d191991c024226c4fc17810391ad680ab2c43c5435		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D5 10740 bytes
font_02_sfnt_off0001158b.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1158B 4324 bytes

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