Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f5381d44a2e8069…

MALICIOUS

PDF

85.3 KB Created: 2021-03-10 00:11:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 048d4d4de82c6b5f42f59265f9d4c2b3 SHA-1: cb5eb1c14c7ad9e419467803f5d6e81e2db3825a SHA-256: 4f5381d44a2e806973acc3ecd29cb62d7e0129ad2773486f099fc53318610522
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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 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.
  • 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://zajinet.ru/award?keyword=july+month+current+affairs+pdf+bankers+adda PDF link annotation
    • https://dopovebo.weebly.com/uploads/1/3/4/4/134431975/58e422c6da323ac.pdfIn PDF document text
    • http://eurozone.pro/4199134823490wng.pdfIn PDF document text
    • https://rusizatigaj.weebly.com/uploads/1/3/4/0/134041601/kaxabuvaxofube.pdfIn PDF document text
    • http://ompala.store/51712752658aay8v.pdfIn PDF document text
    • http://loveworld.club/does_islamic_architecture_exist9o4fw.pdfIn PDF document text
    • http://vas-rem.ru/cura_retraction_settings_anet_a8a18n5.pdfIn PDF document text
    • http://by-roof.ru/7795519570173w5k.pdfIn PDF document text
    • https://titanukudolilip.weebly.com/uploads/1/3/6/0/136082060/nizegadanusojog.pdfIn PDF document text
    • https://leximefowa.weebly.com/uploads/1/3/2/6/132680903/938a321a5b61.pdfIn PDF document text
    • http://epaytds.xyz/lagu_coldplay_fix_you_covera2x5m.pdfIn PDF document text
    • http://copyright-infringement.business/mini_golf_colorado_springs_academy_blvd5wyj3.pdfIn PDF document text
    • https://juwavade.weebly.com/uploads/1/3/4/5/134526694/18f056dac3b080.pdfIn PDF document text
    • http://tonagruz.ru/blodgett_convection_oven_not_heating_up42bqa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://solezujufor.rf.gd/friction_worksheets_for_3rd_grade.pdfIn PDF document text
    • https://76bf09fe-c378-4d6f-baa9-beaf48595a8b.filesusr.com/ugd/61567a_3ef3df29f4d443af9be9ead2c91c0275.pdf?index=trueIn PDF document text
    • https://8eccd3b7-fb20-4588-a5b5-4d8c58591879.filesusr.com/ugd/0e6328_445da4ebfa38488699766747bed7fee5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mikibetiv/womox.pdfIn PDF document text
    • https://s3.amazonaws.com/zowibatev/star_sports_football_live_apk.pdfIn PDF document text
    • https://feedbc21-cb93-402c-9ae2-3476589645d2.filesusr.com/ugd/f3ecbe_cdaeeaf505e3491a92b467bf1c023204.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/incident_response_playbook_template.pdfIn PDF document text
    • https://39c10a3a-92c6-412a-a1bb-b8a1fc48fbc4.filesusr.com/ugd/259099_2b80b41cf4d64b8fb8c743533b26bcff.pdf?index=trueIn PDF document text
    • http://perevis.epizy.com/35331947034.pdfIn PDF document text
    • https://a2ae8793-a99f-480d-a3bc-849ef63d34f7.filesusr.com/ugd/cc207a_8f9b5d6a8f734a6cb28b6758c106491e.pdf?index=trueIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB03 5688 bytes
SHA-256: a4156c534b465916ae7f1d56fe88e14d7dbc77477014d274a6ab5fa4012cbf69
font_01_sfnt_off0000fe35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE35 3720 bytes
SHA-256: d5ecec3e822993868ba70e247019bcdb656a9fee58d620eb93bc70658e929280
font_02_sfnt_off00010998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10998 10264 bytes
SHA-256: 9f1a5a93f3ac2505091835a6621ebd64e9a978c614efa25b20455f6f57f91851
font_03_sfnt_off00012cfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CFA 7580 bytes
SHA-256: 374f9a772976dee6ee87fc15017b48cc0b70170cf1dbec6784931967fde2fa7d

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