Malicious PDF — malware analysis report

Static analysis result for SHA-256 d53bffabd17c9797…

MALICIOUS

PDF

77.8 KB Created: 2021-04-05 13:29:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 264fb253a3a4fa2e840d727c09aeb7ff SHA-1: 209de12258ac473ea9b3f1aa071ec448a012b1a0 SHA-256: d53bffabd17c9797914b4c0cab60042c0e268f1b07ebaec8c965cdbc70941326
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, suggesting a link farm designed to redirect users. The presence of external URIs and the overall structure indicate an attempt to trick users into visiting malicious sites, likely for credential harvesting or malware distribution.

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://xajibur.ru/strik?utm_term=bengali+to+english+dictionary+download+for+computer PDF link annotation
    • https://cdn.sqhk.co/pibepufas/KbiibeY/2750737220.pdfIn PDF document text
    • http://zedakobogesa.mypressonline.com/61103033818.pdfIn PDF document text
    • http://basagutidabe.sportsontheweb.net/learn_car_mechanics.pdfIn PDF document text
    • https://cdn.sqhk.co/keridola/6gjihjf/video_bingo_mentone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501975/normal_604493ed070af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379363/normal_600a49348b5d7.pdfIn PDF document text
    • https://puzugisebo.weebly.com/uploads/1/3/1/4/131438758/sajexumasex.pdfIn PDF document text
    • https://cdn.sqhk.co/jasurisunav/jcjhdUO/48578013866.pdfIn PDF document text
    • http://xerujupuje.sportsontheweb.net/kokodejunako.pdfIn PDF document text
    • https://meboguvogo.weebly.com/uploads/1/3/1/4/131437667/02c444ea700.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501961/normal_605a541f51dea.pdfIn PDF document text
    • https://cdn.sqhk.co/demawanetufi/ihj5ieR/e_pluribus_unum_eagle_tattoo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367921/normal_6060adcdd135c.pdfIn PDF document text
    • https://cdn.sqhk.co/guzoladip/gtuFRRW/mcdonald_s_phone_number_nearest_me.pdfIn PDF document text
    • http://gimemuwet.mypressonline.com/45961955340.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fubavinexazixo.onlinewebshop.net/kujozevawadig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e628e6db-56a5-42ba-96ff-db2bca2a20b0/94860890280.pdfIn PDF document text
    • http://ferodibev.onlinewebshop.net/does_t_mobile_signal_booster_work.pdfIn PDF document text
    • http://vilatelisoto.onlinewebshop.net/under_the_volcano_steak_night.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7136bd26-a98e-4057-b70e-e98786dc1f7a/cuales_son_los_sintomas_de_la_prostata_mala.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aea88280-194a-4b0b-8d2e-b8015c341d6f/power_supply_tester_wiki.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF66 5812 bytes
SHA-256: 88442fa9bfe9c1d37369dd8d206110bea2fe4105365a101aa99fbb8e3a7b663b
font_01_sfnt_off0000f31d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31D 5240 bytes
SHA-256: 3c09cbca591d537c800f7a879a4006e8a59922da77ba657579c90a98656280b9
font_02_sfnt_off00010426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10426 10924 bytes
SHA-256: 54b0fe23f65deecb9b04a9eed4096e7f7d0600c640022605d8f67d0382d8ee20