Malicious PDF — malware analysis report

Static analysis result for SHA-256 f823fcfe267422b5…

MALICIOUS

PDF

79.2 KB Created: 2021-03-15 14:41:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2796ee8559b03b8c257b8f5f7046bb4b SHA-1: 765f5fca0841459aa4aa55804cd49f47d9a11eeb SHA-256: f823fcfe267422b50fa6645d93ac79b87bf0be478f0d658db61f2134e4170411
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to manipulate search engine results or redirect users to potentially harmful content. ClamAV and ML classifiers strongly indicate this is a phishing or malicious PDF. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it may leverage embedded JavaScript or other exploits to achieve its malicious goals.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/award?keyword=college+application+timeline+pdf
    • https://cdn.sqhk.co/tobamozusaj/4gjidbN/lock_screen_wallpaper_hd_joker.pdf
    • https://cdn.sqhk.co/xudevekelefe/H5BiicT/66494726255.pdf
    • https://rurawovupotoli.weebly.com/uploads/1/3/4/0/134017211/198d443.pdf
    • https://vakikuxikedeti.weebly.com/uploads/1/3/5/3/135320305/vuzano_gojijokug.pdf
    • https://cdn.sqhk.co/rojarimeg/ZMIiaje/ornl_fcu_mobile_app.pdf
    • https://cdn.sqhk.co/zokosofu/hgjjjjW/democracy_women_s_plus_size_jeans.pdf
    • https://cdn-cms.f-static.net/uploads/4385863/normal_6023ff2897c11.pdf
    • http://libralab.digital/free_charity_event_program_templatefsqfm.pdf
    • https://jovonawokemurif.weebly.com/uploads/1/3/4/6/134678447/telalorerekufoz.pdf
    • http://uspeh.icu/hero_4_black_casedk3i7.pdf
    • http://kigurumi.org/jeragitexuzjhwhf.pdf
    • https://cdn-cms.f-static.net/uploads/4404490/normal_604d7db0408b7.pdf
    • http://itawegan.space/bill_nye_rocks_and_minerals_worksheetdo1pz.pdf
    • https://bubamixidik.weebly.com/uploads/1/3/4/6/134657394/28e76.pdf
    • https://sudarotabodubig.weebly.com/uploads/1/3/1/4/131407445/4607504.pdf
    • https://belujewirozem.weebly.com/uploads/1/3/2/6/132681559/balunigutatef.pdf
    • http://comp-arenda.site/english_speaking_course_online_appswenr.pdf
    • https://xaxaguxoludu.weebly.com/uploads/1/3/4/5/134519627/1575307.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/fexuror/mensa_iq_test_answers.pdf
    • https://s3.amazonaws.com/gagagakigibapo/amazing_grace_instrumental_piano.pdf
    • https://s3.amazonaws.com/rizoli/leica_m6_e_m7.pdf
    • https://s3.amazonaws.com/labitajaxatufib/bengali_movie_i_love_you_song.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eccf.bin
64ccc817ca95f5f443294f26b3fd7bc2c337b1d7b752a728a29b239fc47d7cf1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECCF 5012 bytes
font_01_sfnt_off0000fdcc.bin
cd3ea3ca276e720119d6d6c5c974e77a3d1f0c3bdf539323f4ae3640280024e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCC 10344 bytes
font_02_sfnt_off00012149.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12149 4324 bytes

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