Malicious PDF — malware analysis report

Static analysis result for SHA-256 2560053e955b3e71…

MALICIOUS

PDF

85.9 KB Created: 2021-04-04 15:19:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 4822e5b3aa33d0663adacb0ba8e0ea9e SHA-1: 7b40caab4eebf39350d835ecab06a801318304e6 SHA-256: 2560053e955b3e716a5a9ab0b62cd9536764e3990daa02bed9e6b856d9a79d33
126 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to domains with unknown or suspicious reputations, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains keywords related to the embedded URLs, reinforcing the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://bologen.ru/award?keyword=kerosene+poisoning+treatment+pdf PDF link annotation
    • http://sifaritube.sportsontheweb.net/84697787914.pdfIn PDF document text
    • http://usecabinets.xyz/86355997481vu23q.pdfIn PDF document text
    • http://sellforce.ru/43035960951mdm4c.pdfIn PDF document text
    • http://bitcoinchat.fun/how_to_trade_forex_for_a_livingsh7yr.pdfIn PDF document text
    • http://bellissimo.online/puvanebofuleliwefafisui.pdfIn PDF document text
    • http://kerutugizuxig.mygamesonline.org/96997781726.pdfIn PDF document text
    • http://kerosijuvibeg.scienceontheweb.net/77945180152.pdfIn PDF document text
    • https://cdn.sqhk.co/gefimiwotux/aidieLa/rugby_league_nz_vs_lions.pdfIn PDF document text
    • http://montana-media.com/748160795388vu6k.pdfIn PDF document text
    • http://melowimaz.getenjoyment.net/ap_budget_2020_20_in_english.pdfIn PDF document text
    • http://mobufuwiwid.medianewsonline.com/horoscopo_de_hoy_por_el_profesor_zellagro_capricornio.pdfIn PDF document text
    • https://cdn.sqhk.co/voxedifi/m5SakSl/hematology_report_definition.pdfIn PDF document text
    • http://gazupoz.sportsontheweb.net/auto_education.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://saboveliga.myartsonline.com/87686844279.pdfIn PDF document text
    • https://73e25548-3913-4bbb-aa69-a1b25f69568d.filesusr.com/ugd/cece23_ad2c0713722f4821a2ea0d9f238063d9.pdf?index=trueIn PDF document text
    • http://mulapoxe.onlinewebshop.net/spanish_learning_files.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40b66953-dffa-4281-990d-d3bc17407a02/how_to_do_crochet_left_handed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32a402df-f864-4aa8-87d2-ca57920d08bb/phonics_year_1_english_worksheets_free_printable_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4be7be5-33ab-4a33-817a-7cf430afd922/ps_vita_2000_us_release_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/715c5dd6-063e-422d-bcbe-4856c827ef6f/44282900382.pdfIn PDF document text
    • https://835a0401-7144-467e-aacc-710587930ffc.filesusr.com/ugd/432cba_259a64cedb594e6d8c8d9f8d4a8b248d.pdf?index=trueIn PDF document text
    • https://7afcd0b8-98df-42a4-afe0-9544d44c9539.filesusr.com/ugd/74e9cf_ad9f466bcdf84c0289ea43c776c6e6c8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/81393097-32fe-49a5-a5ab-8e0941e43aa2/gabalezavevanigebu.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001063e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063E 5088 bytes
SHA-256: f9ca57d7eab4c8cde9ff0fc4b8c2a762d67c728bfba9aa8516399aa3c5536cfb
font_01_sfnt_off00011774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11774 10696 bytes
SHA-256: a365fbb95028b86d56ba6859e8d396b18e0575316b2eba86f47ebe5552fc67bd
font_02_sfnt_off00013bf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BF8 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378