Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3bb0d84c2551f12…

MALICIOUS

PDF

83.2 KB Created: 2021-05-08 20:32:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 48b3b2f4b4dfc4c2ccce9363d80c24b6 SHA-1: 7a9b29c074e58bfe0dbad8e17abb8c37dbedd4a4 SHA-256: f3bb0d84c2551f121303f203d602e2fea74136aa178bf880b352c032e2248426
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML and ClamAV, indicating malicious content. The document body, though heavily obfuscated, suggests a lure related to exercise solutions. The presence of numerous external URIs, many pointing to disposable hosting or link farms, strongly suggests a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure itself likely contains embedded links or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://dafemum.ru/strik?utm_term=simulation+with+arena+exercise+solutions+chapter+5
    • https://wegonugu.weebly.com/uploads/1/3/4/0/134040733/8549721.pdf
    • http://s7hmus.org/tigobadelebnfuj5.pdf
    • http://vikunokanafigul.66ghz.com/medical_certificate_format_for_central_government_job.pdf
    • http://wobixoka.66ghz.com/oricom_dect_cordless_phone_with_answering_machine.pdf
    • http://topvideo.design/jatadimijakefukids4c6p.pdf
    • https://cdn.sqhk.co/lididiregi/hfmjfrJ/games_like_toca_hair_salon_3.pdf
    • https://cdn.sqhk.co/vesagivara/kQgcbjc/fulezapubexisunesoto.pdf
    • https://duvozeja.weebly.com/uploads/1/3/0/7/130739152/wifunopevawape-tidekusereza.pdf
    • https://cdn.sqhk.co/bujasugawo/8Rr1ggN/98362861244.pdf
    • https://cdn.sqhk.co/tijaxasazuwi/ghuhghe/pokemon_wallpaper_iphone_charmander.pdf
    • http://cherrypimp.online/oster_14_cup_food_processor_partsaanpb.pdf
    • http://mepanawabopod.22web.org/bible_study_guide_free.pdf
    • https://cdn.sqhk.co/wabogojo/JxjjjcM/the_amazing_world_of_gumball_cast_penny.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gorefadusajog.rf.gd/6193997483.pdf
    • https://uploads.strikinglycdn.com/files/3a03d3c4-4c85-43e9-8c8a-aa5fbd1567c2/xidudomanonagazoxen.pdf
    • http://fevurilaj.epizy.com/kadasenokewup.pdf
    • https://uploads.strikinglycdn.com/files/2f35e3b6-ff13-4a64-b100-04de99e0446d/d-link_dns-321_firmware.pdf
    • http://jezanijumoz.epizy.com/nox_player_android_emulator_free.pdf
    • https://uploads.strikinglycdn.com/files/36824137-d884-449c-9d31-b596da1948da/92465452955.pdf
    • http://zisekajoreva.epizy.com/79764585927.pdf
    • https://uploads.strikinglycdn.com/files/8dc44e68-d6c4-4928-a823-f726910d9423/jizig.pdf
    • https://uploads.strikinglycdn.com/files/d821ac19-e6b0-4dc7-8283-e18739e14785/how_to_program_keyless_remote_for_craftsman_garage_door_opener.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_off000102ff.bin
315253badb4e645807acca407b7534535af6ea30ad986c745bb921bde3464be4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102FF 5560 bytes
font_01_sfnt_off000115d1.bin
5bd6cddf3889546d313df4c5452d32e45da38d9025018cfc156a307ab131166a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115D1 11404 bytes

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