Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc79b3854ca00596…

MALICIOUS

PDF

79.0 KB Created: 2021-03-18 09:15:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: de37bb02ad61cad37006777e81965f9e SHA-1: 71351134063a44549bb022f6482781f1e1aa1ec6 SHA-256: bc79b3854ca00596357a98f104ef5ea33f404bc41c58814d65054d131fd4e96a
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm designed to redirect users to other PDF documents. The embedded URLs and the document's structure suggest an attempt to manipulate search engine results and lure users into downloading further content, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 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://baarspo.ru/wix?keyword=spotify+apk+pc+version PDF link annotation
    • https://lemefiware.weebly.com/uploads/1/3/4/0/134017231/2d05223.pdfIn PDF document text
    • https://judexibegajojid.weebly.com/uploads/1/3/4/8/134885636/4929102.pdfIn PDF document text
    • https://penusifobituje.weebly.com/uploads/1/3/4/3/134314418/6392990.pdfIn PDF document text
    • https://juwaxevepatasi.weebly.com/uploads/1/3/0/8/130874094/resogikonevuw.pdfIn PDF document text
    • https://cdn.sqhk.co/dezorevukor/givcpok/39692148151.pdfIn PDF document text
    • https://cdn.sqhk.co/janimivaxo/jighjhd/gefulibowomuzipoz.pdfIn PDF document text
    • https://cdn.sqhk.co/lojosewude/oOoDig8/41259633698.pdfIn PDF document text
    • https://disovipogazita.weebly.com/uploads/1/3/1/3/131398104/nobutumininur_tofisaza_nozuzijebipa_wugobiwulutune.pdfIn PDF document text
    • https://vutavevivusupe.weebly.com/uploads/1/3/0/7/130776898/judubirerazenut.pdfIn PDF document text
    • https://cdn.sqhk.co/tosobulig/KAjfjfm/pnm_pure_nintendo_magazine.pdfIn PDF document text
    • http://memexeti.66ghz.com/mimikipenawulurifirup.pdfIn PDF document text
    • https://kalepadakib.weebly.com/uploads/1/3/1/6/131637037/sijexafurofis-gogomalobof-wopanawedegan.pdfIn PDF document text
    • https://cdn.sqhk.co/vebapejun/c2jbEii/xiriwigasitowuxo.pdfIn PDF document text
    • https://tobevasisutigi.weebly.com/uploads/1/3/0/8/130814636/81db7.pdfIn PDF document text
    • https://zokilare.weebly.com/uploads/1/3/4/7/134767859/zedoriweziz_venasofokekaval.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/shareholders_agreement_form.pdfIn PDF document text
    • https://01c19f78-c7d0-441a-b56a-8672493f87de.filesusr.com/ugd/9d66c7_18ab559213484666a47a306deb7a4a5c.pdf?index=trueIn PDF document text
    • http://pamikope.epizy.com/55024844711.pdfIn PDF document text
    • http://gexusapinofuvep.epizy.com/podaz.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/ley_de_ohm_fuentes_de_voltaje_energia_y_potencia_electrica.pdfIn PDF document text
    • https://s3.amazonaws.com/gagagakigibapo/41331868958.pdfIn PDF document text
    • https://s3.amazonaws.com/tutasujal/compound_probability_of_independent_events_worksheet.pdfIn PDF document text
    • http://terefikug.epizy.com/kerner_commission_report_summary.pdfIn PDF document text
    • http://didiwufujoloj.rf.gd/sobojenilozofavufusezubin.pdfIn PDF document text
    • https://7d33af4c-acfd-4996-9436-348e89828b5b.filesusr.com/ugd/289672_2f124cdc2d3743c0911333852bc0312b.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F8 5304 bytes
SHA-256: 0c996f84eafd0ac84049cd1beb472965ff313c22c66d6f60235aac02880b642c
font_01_sfnt_off00010a2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2B 10628 bytes
SHA-256: ac2882372d3c26705558246302fe29047c962b513aef4a7271513ec3c659bd37