Malicious PDF — malware analysis report

Static analysis result for SHA-256 065de88fd2d67f39…

MALICIOUS

PDF

66.3 KB Created: 2021-04-04 16:36:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 8c4c34d0ab62476743f495e086f72308 SHA-1: 6589ff8179a3b89060d0c9fab95b08afe9b881f4 SHA-256: 065de88fd2d67f396c55ae00eda12fa02238c2227d6ac49e02572b7951035c2c
126 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable domains and link farms, suggesting it's part of a phishing or malware distribution scheme. The PDF structure and embedded URIs are consistent with attempts to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://ponafet.ru/award?keyword=vce+textbooks+pdf+download PDF link annotation
    • http://de-bewertung-id-q2e5t23.top/30_day_green_smoothie_diet_plan0hj7b.pdfIn PDF document text
    • http://okstore.info/2754568430ingw1.pdfIn PDF document text
    • http://clebohets.xyz/midwest_states_worksheet0brhj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379731/normal_5fc7b6079b28e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401716/normal_602d8ddb6fc91.pdfIn PDF document text
    • https://cdn.sqhk.co/rizuwevize/bpgihVN/66570606935.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413590/normal_6013c198f3938.pdfIn PDF document text
    • http://my-favshoph.online/geometry_cpctc_proofs_worksheet_answers3dgiy.pdfIn PDF document text
    • http://cashbackk.site/gary_vaynerchuk_wine_story6xphb.pdfIn PDF document text
    • http://golosa-spasibo.ru/728841852520upks.pdfIn PDF document text
    • http://lovechat24.club/1991_craftsman_gt6000_manualxkjd0.pdfIn PDF document text
    • http://moneymaya.site/cn23_customs_form_australia_postcwoiy.pdfIn PDF document text
    • https://cdn.sqhk.co/satijumok/h6Wlcbq/identify_any_caller.pdfIn PDF document text
    • http://lngcliente.com/4161877892031csd.pdfIn PDF document text
    • https://cdn.sqhk.co/vovawumusa/yjcjVgf/zombie_apocalypse_paintball_hayride_location.pdfIn PDF document text
    • http://autolombardpro.ru/80443511933cs3yy.pdfIn PDF document text
    • https://cdn.sqhk.co/tikalamin/xIhg1Nn/luke_bryan_country_girl_wiki.pdfIn PDF document text
    • http://form-lnstagramverifiedbadges.com/2392624966493y5u.pdfIn PDF document text
    • http://teplotronic.ru/751138974539nm5q.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503584/normal_60560023c73b3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495985/normal_5fe269e0ef0cf.pdfIn PDF document text
    • http://barbanapoli.moscow/dota_2_storm_spirit_pro_guidedyw43.pdfIn PDF document text
    • http://wirelessinfo.ru/84847718108w3qak.pdfIn PDF document text
    • http://save50it.info/how_to_make_easy_paper_roses_step_by_steptey3c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c61e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC61E 5380 bytes
SHA-256: 1700c434983a4ecc74179427b6aeb8e64713331cc4d602a684be9f9002c6eb51
font_01_sfnt_off0000d89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89D 10352 bytes
SHA-256: 0055aa172b186bfa74c7f8b01fb9f2b60d2887f747b66e0a80fcb5f22101fb57

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