Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2d5598a8e51ecf0…

MALICIOUS

PDF

81.2 KB Created: 2021-09-22 13:35:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 194a8732e2296f810d5deb2d5ec04493 SHA-1: c03c12073877bc998bbeb1242f1959a5f7eebb96 SHA-256: d2d5598a8e51ecf0a55414516b86dfe47bbfd9ea0b2cbb251681bf4dbaee293b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple disposable domains hosting PDF files. The primary malicious URL identified is http://tatugigo.com/ckfinder/userfiles/files/sisemigobebeluwevasofo.pdf, which is likely intended to deliver a malicious payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://tatugigo.com/ckfinder/userfiles/files/sisemigobebeluwevasofo.pdf In PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/22231249808.pdfIn PDF document text
    • http://pioneerbuzz.net/userimages/52500458671.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/lalulipemot.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/pavegizuxogise.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/55782423875.pdfIn PDF document text
    • https://yuktogel.com/contents/files/74158948328.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b056113e1e---puxutogaterujuru.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/24992426446.pdfIn PDF document text
    • http://idroter.org/userfiles/files/gemujigubamanewipazaraka.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1d4f2ed6c31609ec660a1762f12295bd/10498868036.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/29284515006.pdfIn PDF document text
    • http://marjoleintje.nl/include/userfiles/xemopalagalutipaxobife.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/nodojirifu.pdfIn PDF document text
    • http://duef.ru/public/file/mupox.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210902042944_1879349106.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/vufajopipemi.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/votop.pdfIn PDF document text
    • http://thietkewebsite.btccorp.vn/uploads/files/11491626880.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/rizurekupe.pdfIn PDF document text
    • http://chieucoingason.vn/files/wipigavagasugoteve.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/mojeruruwafudojeruvo.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/39544548618.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=full+stack+android+developer+skillsPDF 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_off0000d59a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59A 10744 bytes
SHA-256: c1d8210b394bdd35cfec948f054ff0261eaab6bcd4a12c4a7ea1f33ef2d51ca2
font_01_sfnt_off0000ee72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10684 18272 bytes
SHA-256: 7a982987a6c0ebcd708ae70e061fc953fa368458358d379152077b58ffc5b95d