Malicious PDF — malware analysis report

Static analysis result for SHA-256 7be9588125ca960b…

MALICIOUS

PDF

81.8 KB Created: 2021-03-14 08:37:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1ca322e143f5211d986242f834ace92 SHA-1: 5b5ff5516b4e3a1e1b0da92db91b7de2ec9fe8b4 SHA-256: 7be9588125ca960b3aed0ff437f7365d07319e721d28796b4d0a9194ca031b2f
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it contains an external URI and a callback phishing phone lure, suggesting an attempt to trick the user into contacting a malicious entity. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://ponafet.ru/award?keyword=as+nzs+1596+pdf
    • https://cdn-cms.f-static.net/uploads/4489245/normal_6038567fbfe30.pdf
    • http://litazil.22web.org/transparent_concrete_seminar_report.pdf
    • http://trysalon.xyz/epson_xp-400_ink_cartridgesaxc8t.pdf
    • http://tranquils.space/how_to_draw_a_realistic_dragon_step_by_step_with_picturesg4lip.pdf
    • http://boxberry-24.cc/washington_football_team_quarterback_injury_videoesknl.pdf
    • http://testrun.ru/blackstar_id_core_40_v2_reviewc5kxe.pdf
    • http://reliables.ru/dell_24in_uhd_monitor_p2415qkm5b8.pdf
    • http://differencecheats.net/5023875441a1mct.pdf
    • http://fruit-ital.space/fotalazisixiwopinipopowanebrmx.pdf
    • http://lnstagram-helps-contact.com/sigegulalilu7mef7.pdf
    • https://static.s123-cdn-static.com/uploads/4424040/normal_5fe566ffe8449.pdf
    • http://hookup757.fun/jifaleximih5qj.pdf
    • http://lnstagramcopyrightservices.org/bronchiolitis_aap_guidelines694bb.pdf
    • http://bit-ipo.ru/lynx_lake_fishing_report_july_20187tj1m.pdf
    • http://50off.pro/pongo_and_perditad4v4w.pdf
    • https://cdn-cms.f-static.net/uploads/4484807/normal_601dbf3965c48.pdf
    • http://ig-socialmedia.xyz/flow_diagram_symbols_and_meaningsfo5m1.pdf
    • http://tikonazab.iblogger.org/ph_balance_food_list.pdf
    • https://static.s123-cdn-static.com/uploads/4419003/normal_5fcbd47b26254.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.fontrix.comhttp://www.nhncorp.com
    • https://cd29ef07-728f-4a0b-b57b-23e770395c36.filesusr.com/ugd/f14cf6_ae8c5035b81744c8bf51fbc441765b33.pdf?index=true
    • http://wimixuv.epizy.com/66568175571.pdf
    • https://1ffb5d6c-d890-49e0-9b87-dc10fbfa49e2.filesusr.com/ugd/8bc2a6_762154b78b174f7ebe283c84cded42b4.pdf?index=true
    • https://73ea35ec-f0b0-4773-8bcb-d62b778c7de8.filesusr.com/ugd/a8e976_c40cf1064aa84a40a22f644b8a83b728.pdf?index=true
    • https://78151a86-a557-4e49-81aa-a2539eea45c7.filesusr.com/ugd/204f4f_ff7cd31fa2ca430088188f253fab6142.pdf?index=true
    • https://945b3f91-9c76-4178-be32-f0dab3cfe2c6.filesusr.com/ugd/8d5d69_6e5c91b2b33541db9ef225dfd8e82a2d.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_off0000f74e.bin
c817e1241a8d6fb17088254dc70673186062555edd4d2b4574b5006d891f56f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF74E 5220 bytes
font_01_sfnt_off00010936.bin
e507bd3c1c30479637b87f3fbcdba197a9c5e8a5fa6b9407e01150292c942e02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10936 11440 bytes
font_02_sfnt_off00013021.bin
fe8b913e1de3bbc0eee2a99c7cc5b6edc7392e980ee1de58df5eadb8339b74d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13021 2228 bytes

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