Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfec5caae3b34286…

MALICIOUS

PDF

97.6 KB Created: 2021-03-13 18:03:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8371ba21e6092e5ff5fbd546da516bfe SHA-1: d15ed270232a404037b52a1e81678b0cc3a6384f SHA-256: dfec5caae3b34286baac3ea3982828d1403db12c382691dc5d57b88b4d930343
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content or phish for information. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 7

  • 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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://soxebez.ru/wix?keyword=an+embedded+software+primer+pdf+free+download
    • http://widonatozeg.mypressonline.com/whats_a_chickpea.pdf
    • http://madewithsunshine.com/little_panda_farm_story_mod_apk_unlimited_money1ab4m.pdf
    • http://pexarinolal.mypressonline.com/eso_false_god_nerf.pdf
    • http://mnogoturov.com/the_criterion_collection_wikiklv0w.pdf
    • https://cdn-cms.f-static.net/uploads/4377125/normal_6013250d1266d.pdf
    • https://static.s123-cdn-static.com/uploads/4486975/normal_5fdd95ee7bb9b.pdf
    • http://xolokukifimiv.sportsontheweb.net/80087251559.pdf
    • https://cdn-cms.f-static.net/uploads/4374968/normal_5fe9cf863978d.pdf
    • http://zitalogeloluwiw.mygamesonline.org/mimekulezud.pdf
    • http://yudekor.ru/business_support_manager_job_description_example6d868.pdf
    • https://static.s123-cdn-static.com/uploads/4459481/normal_5ffe1da23ba60.pdf
    • http://nejevefivi.mypressonline.com/rokixisefunejido.pdf
    • http://gejedesoni.getenjoyment.net/mechanical_engineering_manager_job_description_sample.pdf
    • http://granitmetrospecstroy.ru/venisatqushh.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://709e7e89-b264-4d73-b757-064736ed86f1.filesusr.com/ugd/f523c3_d1260611bb4147be99e4b4406bc3ba16.pdf?index=true
    • https://3d73ec66-e24e-4607-99a5-aa3c333c10ea.filesusr.com/ugd/a96454_0aecc509ecf942c8b8f257bc102676c2.pdf?index=true
    • https://a4346b84-4611-49ab-b113-80c9188ca613.filesusr.com/ugd/078c79_d1dc960eb8c74bbea2409fee35e06d14.pdf?index=true
    • https://314f4944-3dd9-45af-b5ee-fc7f46c963e4.filesusr.com/ugd/73cb9e_104d2e215c2542da905c73f973e99d91.pdf?index=true
    • http://sijadogif.atwebpages.com/30951761701.pdf
    • https://1dab3517-3db0-43ff-9fd6-b65b51f65b60.filesusr.com/ugd/565485_34d9ac9d36ad4a429daf0b9085154cb2.pdf?index=true
    • https://2489a575-72f7-492f-b117-28cfe4a4d2a3.filesusr.com/ugd/d81705_bf46d42aebae444a9924b3a4878a8ff9.pdf?index=true
    • https://73099f28-10d5-4558-98a1-2f8dc61f1a2f.filesusr.com/ugd/f62eaa_dc7043d66b7c4609b89e5cdc2f97b201.pdf?index=true
    • https://91313464-3f42-441e-b0e8-b27065d471ad.filesusr.com/ugd/ee9d3f_65ae15fa865f4fec8b969ac5f3ec0d7e.pdf?index=true
    • https://a7563df4-ba19-4d82-a8a0-b2470d957038.filesusr.com/ugd/61f964_e551d17ce1474e33933324aa6f7ce577.pdf?index=true
    • https://ea74ff18-003d-4094-8454-8d7e15e33abb.filesusr.com/ugd/50de67_05e2568037514fe5bc745f5a8dfe1c18.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001080a.bin
834b53745e5b84a4ffadc3a11f11691d1345e3fbb539cabff612f2fdd06f6eb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1080A 6972 bytes
font_01_sfnt_off00011f97.bin
aa18ff73b5cfa99fb0619828429b50b4d4ec7e234acb7b41b45a22008673923a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F97 5408 bytes
font_02_sfnt_off000131ed.bin
6b4e54a9a0d912834cddab4c18a05d6440b69c43f2cced28ed88da19fa863702		 pdf-font-stream PDF embedded font (sfnt) at offset 0x131ED 14244 bytes
font_03_sfnt_off0001604a.bin
541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1604A 16204 bytes

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