Malicious PDF — malware analysis report

Static analysis result for SHA-256 77eac60b0a1107b0…

MALICIOUS

PDF

85.2 KB Created: 2021-02-17 01:48:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 91d79eea4d89b203975cb2e776676d9d SHA-1: 927172361c917b0faae012b4823d47f91369f702 SHA-256: 77eac60b0a1107b03eb9e2a87a430539c3293ba3e87642d077f4eb58c2be7017
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9995

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 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.
  • 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://seumenha.ru/strik?utm_term=how+long+do+you+cook+a+25+lb+turkey+in+a+roaster PDF link annotation
    • http://instacopyrightcenter.com/57210875167vubh6.pdfIn PDF document text
    • http://rocketdocs.us/troy_bilt_trimmer_owners_manual8gxy0.pdfIn PDF document text
    • http://wiwafapudipib.iblogger.org/95142530141.pdfIn PDF document text
    • https://fifukujujaki.weebly.com/uploads/1/3/2/6/132680890/8291821.pdfIn PDF document text
    • http://idealicaitalia.website/97371485028ppf5h.pdfIn PDF document text
    • http://zavutodoga.iblogger.org/cut_patricia_mccormick_summary.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483837/normal_5ffb22248df3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472213/normal_602bb292303e1.pdfIn PDF document text
    • http://wowitaly.pro/79445832321k23fp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487381/normal_5fe56df26869d.pdfIn PDF document text
    • http://prodson.fun/math_flashcards_printablesdm5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469349/normal_602554325cb6e.pdfIn PDF document text
    • https://vejazisiji.weebly.com/uploads/1/3/0/9/130969480/61dd277.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
    • https://s3.amazonaws.com/wovisak/nys_homeschool_quarterly_report_template.pdfIn PDF document text
    • https://s3.amazonaws.com/wuvepilamamuse/amgen_annual_report_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/daselex/95118006040.pdfIn PDF document text
    • https://s3.amazonaws.com/lukepepe/conjunction_formal_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/macos_catalina_developer_beta.pdfIn PDF document text
    • http://gawuvuv.epizy.com/como_buscar_mi_android_por_gmail.pdfIn PDF document text
    • https://s3.amazonaws.com/jevelel/irs_moving_expense_reimbursement_guidelines.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f79a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79A 5604 bytes
SHA-256: f38e830f90eb28c431676321421c54363f203e2fdab21cb402c4fb4c3074e9c5
font_01_sfnt_off00010ac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC4 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off00011352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11352 10948 bytes
SHA-256: e3f79ee9ee67ec407fc878bada058bdfd1cbd26654f9344eb54c25c0a0d10ab6
font_03_sfnt_off00013882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13882 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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