Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd1ece62a3e88ee4…

MALICIOUS

PDF

78.0 KB Created: 2021-02-25 17:15:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 6825cdc08e25317bfe98396075124fa9 SHA-1: 9bedecdb63237c5a3b891e9880641c13102deb7e SHA-256: bd1ece62a3e88ee44dfce4cdd61484cdcd1a91e8e004503eae6fc7c284a71c4e
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, 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 URIs are indicative of a tactic to redirect users to malicious content, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/award?keyword=medieval+2+total+war+stainless+steel PDF link annotation
    • http://javoreruja.iblogger.org/free_excel_home_budget_template.pdfIn PDF document text
    • http://my-favshopc.online/fowelefutejokejibongz1by.pdfIn PDF document text
    • https://cdn.sqhk.co/wedowetaso/gijcibb/red_and_blue_jordan_10.pdfIn PDF document text
    • http://lapivezog.22web.org/88196954628.pdfIn PDF document text
    • https://fajorisovobune.weebly.com/uploads/1/3/4/7/134752278/zosokividamuru_wokexakaweseta_vijumoz_wosimeragux.pdfIn PDF document text
    • https://mirurilusenut.weebly.com/uploads/1/3/4/6/134631679/fukejenimejavor-fugidirasul-dapugik-mokijujim.pdfIn PDF document text
    • http://kovopajewasenuz.iblogger.org/wivurilugodam.pdfIn PDF document text
    • http://nefuwumimo.iblogger.org/sqlite_for_python_3._6.pdfIn PDF document text
    • http://komaxinatobofe.medianewsonline.com/xixupuboputuruzozabiraso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393348/normal_6028e827ebb29.pdfIn PDF document text
    • https://cdn.sqhk.co/lapitobexeva/6hgKhjz/26778789611.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vomigok.rf.gd/xurixireku.pdfIn PDF document text
    • http://ziwemasux.myartsonline.com/modal_verbs_worksheets_for_grade_6_with_answers.pdfIn PDF document text
    • http://gurabagoderes.atwebpages.com/does_tegrity_record_your_screen.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_off0000f59a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59A 5108 bytes
SHA-256: 4c17c2b4c8afd45f9a6f8163ff7d5095fdf20bdb7ef6d19429c5cd44b855187c
font_01_sfnt_off00010728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10728 10472 bytes
SHA-256: e05c511600864be867be78c721373ebe6319b22d50e783e469e1d74cc34ed320

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