Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbe6884cfba3fac4…

MALICIOUS

PDF

88.6 KB Created: 2021-03-21 07:24:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae9f2a027711eea8074950f54577dbe4 SHA-1: 16cb582386d94004619c1b0afab8615df2a8f795 SHA-256: fbe6884cfba3fac4db7ae4f86f34c1ff74e78f35c39b2b7fb733be8a75d42654
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents attempting to exploit users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/wix?keyword=space+figures+and+cross+sections+practice+11-1
    • http://dapurixid.sportsontheweb.net/mathematics_for_computer_science_lehman_leighton_meyer.pdf
    • http://paselon.getenjoyment.net/65514137152.pdf
    • http://detaxinema.22web.org/online_phylogenetic_tree_worksheet_answers.pdf
    • http://fejuxit.iblogger.org/rome_total_war_2_campaign_map_tutorial.pdf
    • http://takaweri.mywebcommunity.org/56660117980.pdf
    • http://copyright-rules-help.com/punjab_carrom_championship_2018vg7di.pdf
    • http://pressit.space/giwutegalepafodogay9ab8.pdf
    • https://cdn.sqhk.co/pigexebobe/iajihez/arkadelphia_walmart_automotive.pdf
    • http://woodbonus.net/introduction_to_python_programming_lecture_notesy6gtp.pdf
    • https://cdn.sqhk.co/kizofapekeku/jdijHDM/16426286401.pdf
    • http://mukinumatonewo.getenjoyment.net/voice_caddie_swing_caddie_sc100_review.pdf
    • https://cdn.sqhk.co/tinulafi/jilRgcj/planet_pizza_westport_ct_coupons.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xejobutek.onlinewebshop.net/circuit_switching_in_computer_networks.pdf
    • http://daboloxasorun.rf.gd/leziradovudevax.pdf
    • http://fuguzametekobo.myartsonline.com/third_conditional_exercises_esl.pdf
    • https://uploads.strikinglycdn.com/files/e251f894-401f-4a9a-8399-310c8214e56d/16736339612.pdf
    • http://tuxesoguzegisox.epizy.com/fake_caller_id_apk_dow.pdf
    • http://zumoxevozasumek.epizy.com/66118394751.pdf
    • https://uploads.strikinglycdn.com/files/ace9e201-4f1f-4850-8e8e-a228a3a4a6c0/97455256036.pdf
    • https://uploads.strikinglycdn.com/files/7b2b87d8-6872-4117-b07e-f41a05804641/html_and_css_projects_with_source_code.pdf
    • https://uploads.strikinglycdn.com/files/86cbcd40-82c6-4c1f-88e9-1d1f5479c0de/brother_knitting_machine_kh260.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_off00011b4f.bin
f49c2ecf446c5fb0dc54c0273de806fe8b167523d5bf38d0af80569f97128fef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4F 5480 bytes
font_01_sfnt_off00012e0e.bin
54ac873294a35e3e1a752f0e8c6e56f193bb906d415836813f1b55061f5f5fa9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E0E 11296 bytes

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