Malicious PDF — malware analysis report

Static analysis result for SHA-256 61f6d4c0056a46ca…

MALICIOUS

PDF

85.8 KB Created: 2021-03-09 20:18:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 5799b44ece252611f8aa2effb4dc4d7a SHA-1: 102017e1975b999b4f7786acc073325d4f8f20bc SHA-256: 61f6d4c0056a46ca5e43effa0a7b0e1c553b451709a338db258cb67b93d4f4ba
126 Risk Score

Malware Insights

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

The PDF document contains a high number of embedded URIs, many of which point to disposable hosting or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://nipisod.ru/wix?keyword=utada+hikaru+simple+and+clean+mp3 PDF link annotation
    • https://cdn.sqhk.co/fuluzezufe/ieI9ggd/67814380842.pdfIn PDF document text
    • https://cdn.sqhk.co/nilesatu/ihjbJhi/pakokoxositubeloru.pdfIn PDF document text
    • https://cdn.sqhk.co/tidelefuzin/XtjEZqW/fishdom_levels_too_hard.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451206/normal_5ff758cb343b8.pdfIn PDF document text
    • https://cdn.sqhk.co/rifarako/Fidhcij/7808465636.pdfIn PDF document text
    • http://jijuduli.mywebcommunity.org/soroxulumiruxukus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469836/normal_6016c416dcbf5.pdfIn PDF document text
    • https://cdn.sqhk.co/fasaparoba/geYdjcN/28707822750.pdfIn PDF document text
    • https://cdn.sqhk.co/vexapalas/geq5pxG/xafeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374699/normal_5fd815e31c32e.pdfIn PDF document text
    • https://cdn.sqhk.co/xodokopav/5jhjLjd/billie_eilish_bad_guy_cover_metal.pdfIn PDF document text
    • https://cdn.sqhk.co/noxomosanena/7DBisXH/zaberuma.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://zazisuj.epizy.com/operational_amplifiers_johan_huijsing.pdfIn PDF document text
    • http://furarojakak.epizy.com/nidapuboponunabola.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/raja_babu_song_telugu.pdfIn PDF document text
    • http://toxawilel.epizy.com/tilozuzupipesunizapimik.pdfIn PDF document text
    • https://s3.amazonaws.com/fadadedezeker/solovumapovaj.pdfIn PDF document text
    • https://s3.amazonaws.com/mogipegi/muradodul.pdfIn PDF document text
    • http://sifebitufol.onlinewebshop.net/pizodixabanonetosemewowig.pdfIn PDF document text
    • http://moxurux.epizy.com/90649494410.pdfIn PDF document text
    • https://s3.amazonaws.com/fipijife/android_side_menu_fragment_example.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6E 5304 bytes
SHA-256: a17c136e0e6d08a6241768c81e22cda4dcfc9d5713437a38cbb17decfec314a9
font_01_sfnt_off0000f04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04E 16980 bytes
SHA-256: cb1659e6e07ae7706a9872b6c15f8a679a2ce6e237fac8a9a3a69c3896887808
font_02_sfnt_off000124bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BB 16092 bytes
SHA-256: 9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2
font_03_sfnt_off00013982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13982 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378