Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b1203cc538a509f…

MALICIOUS

PDF

80.9 KB Created: 2021-09-16 19:45:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c4410952539b044472272ffbee036d14 SHA-1: 602cee87bfba19de7d12452c53d36af5ccb2f9c0 SHA-256: 0b1203cc538a509ffb19560cbe1aa062908f93eace0b0c0ba3de1f3e2b16f1dc
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 potentially malicious PDF files, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is designed to host many links on disposable domains. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest it's used to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://greenboo.vn/uploads/files/xonizavegufitikatoruko.pdf In PDF document text
    • https://bahceneryaman.net/public/content-images/files/9455032208.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/lujugo.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/sexolexepes.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/77115569668.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/pofogej.pdfIn PDF document text
    • https://perkunasstudio.com/uploads/files/202109011558528366.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16138b00ce850c---sevalijitezunelirazi.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/belibi.pdfIn PDF document text
    • http://www.atsamuihaus.com/image/upload/File/49529506831.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/kekebafawepibikulakuv.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136687ca15c7---1610135788.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/32540974233.pdfIn PDF document text
    • https://yuktogel.com/contents/files/noxawusewa.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/zowolololewozizovob.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/16332942458.pdfIn PDF document text
    • http://sivam.pl/files/file/ruxixevozebupirifivina.pdfIn PDF document text
    • http://tuivaivietnam.com/uploads/files/demotomizop.pdfIn PDF document text
    • https://maria-galland.ru/files/file/vokekazadofidikuwekusituj.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/farurovejumonewob.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/fubajeba.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/3227405460.pdfIn PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/bewaxefotazowira.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=sound+not+working+on+android+phonePDF 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_off0000d6e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF8 17828 bytes
SHA-256: 35d73d9802e69b8c31ef42884341036a4f76ecbb993e51f2f255a3a42ad08409
font_02_sfnt_off00011d45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D45 10808 bytes
SHA-256: 3bd2f9486ca1397ea0ece1ca86cce91669b364761ad26e7b6fc9c517140110ac