Malicious PDF — malware analysis report

Static analysis result for SHA-256 b90a29ef356218f4…

MALICIOUS

PDF

70.1 KB Created: 2021-10-01 18:34:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1709c8f1a10563cebc7dfb567ef2c50b SHA-1: 0d4584097d8f4523b68d4ac00c46dce94d0fd0a1 SHA-256: b90a29ef356218f486ac1906c55d768da1b7bfc73bbd84079ddd938c238f6202
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious domains, suggesting it functions as a link farm or phishing lure. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kebufunemomajapupoxafon.pdf In PDF document text
    • http://kawana.tech/userfiles/file/vegagoparufo.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/dunifanaga.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/perapoberiva.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/zelebirusopeluwefasijan.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/2021914520407867.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/71700035679.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1002b6a64---katezakabakijeduwuzixarup.pdfIn PDF document text
    • http://shopphutungmayphat.com/upload/img/files/febaliwevenurafuvas.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/17223990391.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/19060272697.pdfIn PDF document text
    • http://knupress.com/pds/editor/file/zakajepirufisotijiv.pdfIn PDF document text
    • https://marlschuz.com/userfiles/files/80172394811.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/31644977479.pdfIn PDF document text
    • http://servmed.net/userfiles/file/zilimavegoxa.pdfIn PDF document text
    • http://chipgene.com/image/files/20210926_174750.pdfIn PDF document text
    • https://halkum.rs/files/33154978446.pdfIn PDF document text
    • https://ever-progress.com/upload/files/melemujika.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/jetuwevuzudiw.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/19/file/26436766911.pdfIn PDF document text
    • https://praktijk-fix.nl/userfiles/image/file/vosozaxuzamufijize.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/31505918144.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=the+joy+of+game+theory+pdfPDF 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_off0000ae19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE19 10744 bytes
SHA-256: 773028469f02ccccea191e457eb606c559322cf135cf9fcedb2a248fac5edcaa
font_01_sfnt_off0000c6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000deb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB9 17448 bytes
SHA-256: ea2bcc56e7f743a7cc120364a8bdbbdd0ef858a1a5e3f01fc0213c0852a935f7

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