Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3db323775cd39df…

MALICIOUS

PDF

70.0 KB Created: 2021-04-08 10:56:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c28ecd32c3f4840637fc0ec79b367003 SHA-1: 938d522f03868ea2e1788262acf7237f2a8ffba7 SHA-256: f3db323775cd39df0968a340a3592cfacdd2316927c586851897424c39830e76
66 Risk Score

Malware Insights

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

The ML classifier strongly indicated maliciousness, and the PDF contains numerous external URIs pointing to disposable hosting, characteristic of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms this behavior, suggesting the document's primary purpose is to redirect users to potentially harmful sites. No scripts were extracted, but the presence of many suspicious URLs indicates a high likelihood of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • 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://pelibifir.ru/strik?utm_term=musical+notes+clipart+transparent
    • http://intekzafast.online/4444002960ommzs.pdf
    • http://lady-bug.club/48867964244loqqo.pdf
    • http://mysteps.online/gudezodepelixoviliwa8ng.pdf
    • https://runanusug.weebly.com/uploads/1/3/5/3/135313332/662d549.pdf
    • https://cdn.sqhk.co/madagijoj/SicieNS/sparkles_photo_editor.pdf
    • http://momentshop.website/wijobokilawijemowipsd7a.pdf
    • https://wunabigoji.weebly.com/uploads/1/3/4/8/134891590/kavogedixozu-balenuwazosul-medul-maxotemu.pdf
    • https://melosuvo.weebly.com/uploads/1/3/4/6/134687736/mexiligizazumet.pdf
    • http://vkrowl.com/tebirokitofemojapavodix7c3yb.pdf
    • https://lonunirixug.weebly.com/uploads/1/3/2/7/132710494/fifadipir.pdf
    • https://bakubirusi.weebly.com/uploads/1/3/4/6/134680497/dosedelomorifat.pdf
    • http://p-kavkaza.ru/37398566644u2gyu.pdf
    • https://jovegubegatok.weebly.com/uploads/1/3/5/3/135318826/saveb.pdf
    • https://cdn.sqhk.co/navotezive/sYiarlq/81710541044.pdf
    • https://xapowukugo.weebly.com/uploads/1/3/4/7/134702937/muvug_mapide.pdf
    • https://cdn.sqhk.co/kifateten/UijwbUS/16828807178.pdf
    • http://world-wild-shop.com/audio_driver_windows_7_64_bit_lenovobabf0.pdf
    • http://car-test.pro/aashto_t_99bkfa7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/banula/avg_antivirus_free_60_days_trial.pdf
    • https://s3.amazonaws.com/fajixe/ncaa_division_2_football_schools_in_california.pdf
    • https://s3.amazonaws.com/dosalapasenow/32224321883.pdf
    • https://s3.amazonaws.com/rejiner/batman_vs_superman_movie_trailer.pdf
    • https://s3.amazonaws.com/fonazuzixagizir/free_airplay_app_for_android_tv.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_off0000d851.bin
aa2b229a5b8df1ebb8781b7a5647825ff51896eb961923b4a302d2f3d57ff4b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD851 4932 bytes
font_01_sfnt_off0000e932.bin
eca8ba1c61712a59f77a5b1b09354b5ad888157895ffe48e7cecd8c3f70de4e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE932 9756 bytes

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