Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a8ed7a37666fd90…

MALICIOUS

PDF

85.0 KB Created: 2021-10-06 12:23:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2ea79fdd0e9cc48fc9855bb26fde3bb5 SHA-1: 36f22039387ee5a6b94612417ed909aaec4c3ba3 SHA-256: 1a8ed7a37666fd904c8fc45f4592cc55054b548b5a8857bcbef18c69ffbd6310
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with a specific heuristic flagging it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://aletihad-group.com/userfiles/files/megufegawapuxope.pdf In PDF document text
    • https://tasivn.com/upload/ck/files/vunebitavisasobus.pdfIn PDF document text
    • http://brenderup.ro/mm/file/54969907349.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/dinutiduzexerimo.pdfIn PDF document text
    • https://bagstyle.uz/images/file/8967743728.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210905015823.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/gabetetepakijuni.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/64001006654.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/36998724536.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/70702398769.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/boroxowuxutatepatu.pdfIn PDF document text
    • https://noddy.nu/images/file/matolafuwapelovawuzavubeb.pdfIn PDF document text
    • http://restauraceeverest.cz/userfiles/file/64071370468.pdfIn PDF document text
    • https://lanjutpt1.com/contents/files/mevewemosok.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/73563943229.pdfIn PDF document text
    • https://procogs.com/FCKeditor/file/65565242280.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/xuravu.pdfIn PDF document text
    • https://faguaflowers.com/images/admin/file/95563983261.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/10813476461.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/93318262849.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/61942568956.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=30+60+90+plan+for+managersPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBA 11044 bytes
SHA-256: fee549d775bcd2e0794b7befaaf9434ed86337078ed1f1a06a985ca0ed9b6eec
font_02_sfnt_off0001174d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1174D 18040 bytes
SHA-256: 5fabf3100cc6ba7469df4e10c0762f5cf7f4940cdd9b9e62c0fbbb61656fa85e

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