Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a9498bc37527578…

MALICIOUS

PDF

86.2 KB Created: 2021-09-09 08:57:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fb2f6d4b848b0eb4e7952be74fbdb21a SHA-1: 05d5e7ee80905a40aa437641e05812c1b96c5772 SHA-256: 0a9498bc375275781dc0af1dc5a4dd38a0aeb6bb17cbea91e6c446f10ac5759d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://nkmate.com/FileData/ckfinder/files/20210908_6739EEDF7A437468.pdf In PDF document text
    • http://makassitools.com/userfiles/file///sexomokow.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/161385d8fb471f---xamegunogo.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/vaputajiposulekes.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/32835364326.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/45823011619.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/91795433983.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/92406245310.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/bc64839d3ee0312af7f556991104b9a7/worujadixiv.pdfIn PDF document text
    • http://interiorsexpress.biz/dayafter/uploadimages/newsimages/file/tupogojedesowujuwozam.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/89680683951.pdfIn PDF document text
    • http://bdnchem.com/upload/files/jejekagoromi.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/38538658018.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/8275173252.pdfIn PDF document text
    • http://kondicionery-lobnya.ru/upload_picture/file/20881918789.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/gomefotujalebilo.pdfIn PDF document text
    • https://matratva.in/userfiles/file/rowomumuvezirazo.pdfIn PDF document text
    • https://85097781.com/upload/files/pujojofowijaleruwesir.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/63568545067.pdfIn PDF document text
    • https://kocarbonag.com/luutru/files/26701842768.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/82834047081.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/selarufazumi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=hercule+poirot+books+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_off0000ee01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE01 17384 bytes
SHA-256: 19ca80e83e9e18182e597cc9e9461009325bfb7ac2ca0e5ffc134ce327266616
font_01_sfnt_off00011ad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132E8 10668 bytes
SHA-256: 965e0a7a749cbcadc015489ee1804d97f649936014ed5c0a9caa7bd741cb47a8

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