Malicious PDF — malware analysis report

Static analysis result for SHA-256 03b848564eea6c6e…

MALICIOUS

PDF

77.3 KB Created: 2021-03-19 17:09:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11ed2ebb6de612afa2227f7d5b39425b SHA-1: dfbac48422a933c19beaaddddb38340bcc105efe SHA-256: 03b848564eea6c6e6ca06d73583d3abecdbcef671112f043ee79e2a9fa7bb5cd
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=vanilla+wow+fishing+leveling+guide
    • https://dojilosadokadog.weebly.com/uploads/1/3/4/8/134890500/gemojo.pdf
    • http://pikejofopon.mypressonline.com/lonivun.pdf
    • https://sigojexubaj.weebly.com/uploads/1/3/2/6/132682800/lasapa.pdf
    • https://cdn.sqhk.co/dapumexader/fiehCRn/moto_loko_hd_game_download.pdf
    • https://cdn.sqhk.co/zupodejadofe/jAhdFhj/95602524031.pdf
    • http://zugapuvu.mywebcommunity.org/how_to_avoid_pattern_day_trader_rule_robinhood.pdf
    • https://vanonages.weebly.com/uploads/1/3/6/0/136083008/7f6e2.pdf
    • https://nesamakamaxo.weebly.com/uploads/1/3/1/6/131636712/ed73a233c9.pdf
    • http://zonerokemub.getenjoyment.net/total_gym_tv_discount_code.pdf
    • http://vatidenow.medianewsonline.com/argala_stotram_telugu.pdf
    • https://cdn.sqhk.co/tojorovexuw/gAxwgeg/apx_wax_vaporizer_manual.pdf
    • https://zotabuja.weebly.com/uploads/1/3/4/5/134510490/jelibusoxolufozi.pdf
    • https://cdn.sqhk.co/kugoxepif/jgqjiiD/rc_racer_disneyland_paris_2018.pdf
    • http://pimifawimonidij.mywebcommunity.org/how_to_reboot_my_fios_cable_box.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/428137ba-d821-4a40-9e7f-e66d1c8ad01d/43976879448.pdf
    • https://uploads.strikinglycdn.com/files/2fbf8a8d-951c-4f8b-b9f4-dd1d87308e26/difumugalu.pdf
    • https://uploads.strikinglycdn.com/files/2ac83a90-fba9-421e-ae1f-cc99b5c869da/donobugizipigilinadifelek.pdf
    • http://livirava.atwebpages.com/what_does_the_term_salad_days_mean.pdf
    • http://kepawomokatuke.myartsonline.com/cognitive_and_behavioral_theories_of_depression.pdf
    • http://gamelaluwer.myartsonline.com/fafije.pdf
    • https://uploads.strikinglycdn.com/files/b17cf753-2338-46c0-bf53-ac0bddfb54d4/singer_simple_3232_bobbin_size.pdf
    • https://uploads.strikinglycdn.com/files/942182f4-fbcf-44f2-8a2c-38ebffdca08a/how_to_update_nook_hd_plus.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_off0000f28d.bin
f0fff2807ed90af40f18557d2af2a9d38f79e7c8f62c0a11047a6a772c16b9c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF28D 5188 bytes
font_01_sfnt_off00010453.bin
863e75cb3e1edf735e272c0664153051347b734beefad812303c55418d824ae8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10453 10512 bytes

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