Malicious PDF — malware analysis report

Static analysis result for SHA-256 dab858b42eade7d4…

MALICIOUS

PDF

77.7 KB Created: 2021-04-27 00:17:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a6763e77137657b9d856df2de5366ba3 SHA-1: dac0578acee3935ac5fe284d684b5299e22066fd SHA-256: dab858b42eade7d4f08bb720502b1af14022e9a270bab56a9b86d67612acfbf5
186 Risk Score

Malware Insights

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

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 0.9991

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://leonvi.ru/strik?utm_term=bob+harper+jumpstart+to+skinny PDF link annotation
    • http://kugejaxewuj.iblogger.org/novel_bastard_devil.pdfIn PDF document text
    • https://cdn.sqhk.co/tititafoza/oQAhgjg/boss_2_bangla_full_movie_free.pdfIn PDF document text
    • https://cdn.sqhk.co/wavudasawete/viaM9ih/kujegilotibipezog.pdfIn PDF document text
    • https://wakukaxowemaba.weebly.com/uploads/1/3/5/3/135303752/kiwuxo.pdfIn PDF document text
    • http://sexugaweguko.iblogger.org/noziliwik.pdfIn PDF document text
    • http://nalovegitiga.22web.org/wejukanekuwarezunagijaxuf.pdfIn PDF document text
    • https://waxalema.weebly.com/uploads/1/3/4/3/134364729/tefizajebuti.pdfIn PDF document text
    • http://nuzarekuzugav.mypressonline.com/seweloxufegiri.pdfIn PDF document text
    • https://cdn.sqhk.co/fojevimexu/mgeligy/soxegekakiv.pdfIn PDF document text
    • https://cdn.sqhk.co/ravusigi/hgfie6g/5205162012.pdfIn PDF document text
    • http://vibawukukar.iblogger.org/paixo_de_aluguel_dublado_utorrent.pdfIn PDF document text
    • http://faponabon.mygamesonline.org/46658052678.pdfIn PDF document text
    • http://xekaleduwam.iblogger.org/81749079516.pdfIn PDF document text
    • https://cdn.sqhk.co/vigesiji/i9kjhic/personal_stickers_for_whatsapp_mod_apk.pdfIn PDF document text
    • https://mizovitima.weebly.com/uploads/1/3/4/2/134266674/8370179.pdfIn PDF document text
    • http://pekokaxa.22web.org/biblia_traduccion_lenguaje_actual_descargar.pdfIn PDF document text
    • https://vokanuxuvewelar.weebly.com/uploads/1/3/4/6/134618840/8f667a9e1c1704f.pdfIn PDF document text
    • https://cdn.sqhk.co/favejofu/fnFMif2/62050497203.pdfIn PDF document text
    • http://kokulotasuz.mygamesonline.org/possessive_adjective_worksheet_for_grade_1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sipesazupijeb.epizy.com/accountancy_project_workbook_class_12.pdfIn PDF document text
    • http://xawatutosewo.epizy.com/newspaper_report_planning_template.pdfIn PDF document text
    • http://purofix.epizy.com/14374538919.pdfIn PDF document text
    • http://pisubepajolosu.rf.gd/books_for_learning_english.pdfIn PDF document text
    • http://wipadafefuxasi.onlinewebshop.net/full_marathi_aarti_sangrah.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE79 5460 bytes
SHA-256: 9ceb0c94fc3df1930186277ca28b8f56bacaf2098b5d4820b35553eeec59964b
font_01_sfnt_off000100e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E7 12044 bytes
SHA-256: 99978d853224fbe1a7008ebe3d34dd9caef36072ec070c5502b63129342daabf

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