Malicious PDF — malware analysis report

Static analysis result for SHA-256 760c2a9ebc704300…

MALICIOUS

PDF

72.2 KB Created: 2021-10-01 19:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0f573ea64f017b3118d4d51fe951fbba SHA-1: b57d11bccde225907e72e088cc0b632c620e4af9 SHA-256: 760c2a9ebc70430097bd849e903b24d374059c7166e7dcc8d27ef9834a8e284a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to disposable domains and are structured to appear as downloadable PDF files, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to distribute content or redirect users through numerous small, distinct hosts. While no scripts were explicitly extracted, the nature of the embedded URLs and the PDF structure strongly suggest an intent to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://quinta.cl/upload/files/xixixenasedikotop.pdf In PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/41349252541.pdfIn PDF document text
    • https://questyme.com/userfiles/file/farofozevomugowuzonurutet.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/fukagusisujevono.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/gufunoxexovamefi.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/zaboni.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/72434797919.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/84963813941.pdfIn PDF document text
    • http://xn--42ci4cc0aric4a6dd7c5af9nef7sg.com/userfiles/files/zifumosonej.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/kopapejoje.pdfIn PDF document text
    • http://onroerendgoedindex.nl/images/uploads/83734024458.pdfIn PDF document text
    • http://teplospectr.ru/images/files/44863161748.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/45063477082.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/61263842540.pdfIn PDF document text
    • http://soc-in.com/data/media/files/59558927527.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c04cd9a7de---siwixiwavamikasomo.pdfIn PDF document text
    • http://congtrinhxanh.vn/media/images/upload/files/47386418970.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/67988017567.pdfIn PDF document text
    • http://studiopassarotti.it/userfiles/files/33817962489.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1615595deb3721---28825343156.pdfIn PDF document text
    • http://mimarathi.live/assets/ckfinder/core/connector/php/uploads/files/xutojomijimizodavelita.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/nofokazetetuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+scan+a+menu+with+iphonePDF 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_off0000b265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB265 19176 bytes
SHA-256: 264cf04064d868fd82df2336f8b649a0f0802f49cc737a865ae34f0064c4ae84
font_01_sfnt_off0000e312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE312 10672 bytes
SHA-256: df31c3bda225f76a53be33673917be18a5459f2fafa8d1c4f15f7ae4ae030a40
font_02_sfnt_off0000fb65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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