Malicious PDF — malware analysis report

Static analysis result for SHA-256 4944e585c0dede02…

MALICIOUS

PDF

75.3 KB Created: 2021-09-14 04:22:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1777473b8a8f159e1bb76e63b08ebdf0 SHA-1: a8d78936cf47e9d670f3c51df8dab42d7a382aa0 SHA-256: 4944e585c0dede0215bbcb04f165c5cdb5741dfb0a68c7220ab611628777eb51
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous distinct hosts, suggesting an attempt to obscure the true malicious destination. The presence of a 'download' button heuristic further supports the phishing lure attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.corazondelsol.es/ckfinder/userfiles/files/39494307239.pdf In PDF document text
    • http://primeasset.hu/fileok/file/56526750480.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/towuwuzegugisukulevitiru.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/kejazejeb.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3b2bc55e7---terisaviwenodop.pdfIn PDF document text
    • https://cyc-catering.pe/disac/userfiles/file/68957436466.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/xibiret.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/ratakajasatufusurakedaz.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/sifebifolugose.pdfIn PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/pupewexizofebewiza.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/35552978223.pdfIn PDF document text
    • http://beta-rc.com/upload/files/zewugusolujakorofafekevat.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/6ihgn806b2598834uhtdplh022/dabagu.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/43289259252.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/gerojixes.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2ecee621c---21952838024.pdfIn PDF document text
    • http://eco-building.cz/UserFiles/File/14377828842.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/vedeg.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/xisemeguvigewuzofawixi.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/62597211095.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/pipejutavexisibuxefisuz.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/76593599591.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/26549325728.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=rise+of+berk+hack+apkPDF 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_off0000c29a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC29A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000daac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAC 17484 bytes
SHA-256: ac802b01f6686dc9d051d93054a3b2d4b0ce9be5f7cbc4203fd35d2a3d26110c
font_02_sfnt_off0001078b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078B 10604 bytes
SHA-256: 7ccd2b4702a2c2b6dc49bf23943ff94bdda3ad51da007a5c2714072173da17f5