Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f45cbe33835de5c…

MALICIOUS

PDF

79.8 KB Created: 2021-09-13 14:08:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d4b5880f0ce6facdda677ae93f6995c6 SHA-1: 0628dad386e70f4b5ecf523c7bb5c6a35be87c10 SHA-256: 9f45cbe33835de5cbf04c3f5af4d8b9c0f9e8e47bd18d77ad5777d44bb100745
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm designed to obscure the final destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. While no scripts were explicitly extracted, the nature of the embedded URLs suggests a redirection mechanism, likely intended to lead the user to a phishing site or to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9762

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://tenshinorchids.com/FCKeditor_upload/file/jefunawamoxitekesekepex.pdf In PDF document text
    • http://lifeline-sports.com/files/file/24885000296.pdfIn PDF document text
    • https://morethancars.eu/uploads/edytor/file/72923129982.pdfIn PDF document text
    • http://giacongcomposite.com/upload/ck/files/dimupunipomaworoxixe.pdfIn PDF document text
    • http://sun-eko.eu/files/file/rukababasorexamamojuj.pdfIn PDF document text
    • http://atletika-pardubice.cz/files/file/77816572895.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/pawakamimep.pdfIn PDF document text
    • http://factorycontrolprojects.com/userfiles/file/74414419132.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/60871304907.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/g4bo2ec4hqm2scql88rnusl2ik/90938363575.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/77589566535.pdfIn PDF document text
    • http://ternovykh.ru/content/file/58019418674.pdfIn PDF document text
    • http://hansungid.com/userfiles/file/19961945177.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/35366637130.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/dozuwiba.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/nebevapodexezujolitenima.pdfIn PDF document text
    • http://sperrincaravans.com/images/file/18142548887.pdfIn PDF document text
    • http://fxlcd.com/upload/file/37256154841.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16133c4056c348---12363893412.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/40219173455.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/lafepitalib.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/xezusijijerigetigisufofow.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/48370154759.pdfIn PDF document text
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/94058596357.pdfIn PDF document text
    • http://sportservistocik.cz/UserFiles/File/gilujizasitajunom.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/juguxol.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/suwunelumevawe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=hill+climb+racing+2+1PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC153 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD960 1868 bytes
SHA-256: b44e304f4199d162c520aa61e4565b27969aa952fa2ee1db3f4cf671ae1a9eb8
font_02_sfnt_off0000e218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE218 10360 bytes
SHA-256: 2aeff2993c438edf8c1664f9868ef706a78ed74ac1b10554cf82ec4352b6f7e5
font_03_sfnt_off0000f969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF969 22004 bytes
SHA-256: 127931d5bbb5035676593ce903ef75450bc77a5f41ab32f9c8f3ce63c11c9f7f