Malicious PDF — malware analysis report

Static analysis result for SHA-256 b824bc9131558aca…

MALICIOUS

PDF

170.3 KB Created: 2021-03-22 02:36:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 8c0290651a350b4267c7ea5f4ecbd5b5 SHA-1: 59327b1beaffd51d09b4a23b89104ad0deafbadc SHA-256: b824bc9131558aca88cfa666d8af65614464a51b61549a977da34d1156fadbd2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9745

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://zajinet.ru/award?keyword=automate+the+boring+things+python+pdf PDF link annotation
    • http://glasshookahcatering.com/wuderoravibositowixojezycfmk.pdfIn PDF document text
    • http://vunirokagora.22web.org/lightning_mcqueen_coloring_page.pdfIn PDF document text
    • https://miduginoxem.weebly.com/uploads/1/3/4/8/134892771/salafeba.pdfIn PDF document text
    • https://vokufasel.weebly.com/uploads/1/3/4/8/134872836/moxezofifobiloz.pdfIn PDF document text
    • http://hellesypakk.online/93187680243s8ym9.pdfIn PDF document text
    • https://pujazoja.weebly.com/uploads/1/3/4/8/134880569/de6cc887f53620.pdfIn PDF document text
    • http://soldonlittleton.com/lubuxilobanaluvh0o60.pdfIn PDF document text
    • http://xelapelumu.iblogger.org/how_to_change_battery_in_honeywell_carbon_monoxide_alarm_xc70.pdfIn PDF document text
    • http://kvrovk.xyz/92191441384n1mg5.pdfIn PDF document text
    • https://tinonerapize.weebly.com/uploads/1/3/5/3/135349756/1050563.pdfIn PDF document text
    • https://tenogamux.weebly.com/uploads/1/3/2/6/132681545/1182442.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sulunaza.epizy.com/pagifoje.pdfIn PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/psl_full_form_in_cricket.pdfIn PDF document text
    • http://budekibume.epizy.com/bhutia_songs_free.pdfIn PDF document text
    • http://pamitum.epizy.com/praise_and_worship_songs_list_nigeria.pdfIn PDF document text
    • http://muwalolerede.epizy.com/iiser_aptitude_test_question_paper_2017.pdfIn PDF document text
    • http://modunozig.rf.gd/affairscloud_april_2020.pdfIn PDF document text
    • http://kelutezawixe.epizy.com/65516175337.pdfIn PDF document text
    • http://filutapokupa.epizy.com/47345203934.pdfIn PDF document text
    • https://s3.amazonaws.com/roware/alcoholic_liver_disease_guidelines_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/vojapu/34970869988.pdfIn PDF document text
    • http://rinudesit.epizy.com/multiplication_commutative_property_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/kujukakosirova.pdfIn PDF document text
    • http://vakutasuv.epizy.com/banomoya_amapiano_mix.pdfIn PDF document text
    • http://tekatekuxukaju.epizy.com/nexazikubon.pdfIn PDF document text
    • http://mevonaku.rf.gd/75973048890.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_off0000f484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF484 115328 bytes
SHA-256: dadc322adc3338fff9379299e732f3ae56ec6f3e23ff433e245ba77757f92609
font_01_sfnt_off00024b0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24B0C 5652 bytes
SHA-256: 06d438008f66962cc7aeb8fc9d886829034a446ee34752d5bf7fa18b09717c72
font_02_sfnt_off00025e1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25E1A 11304 bytes
SHA-256: 38e6b68ff163d0d577d9e122cbb9e626c3423c0e73256b9495a27ec1de483fe3
font_03_sfnt_off00028506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28506 16208 bytes
SHA-256: 76a19cff5479d21ad654617e6298a9cc55b234657085884e38fad804c93f9130