Malicious PDF — malware analysis report

Static analysis result for SHA-256 419507dab41dca9e…

MALICIOUS

PDF

71.0 KB Created: 2021-09-26 12:12:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 62b40c65899b36ecefb1606995b0f4b5 SHA-1: 9c77a2b4e99292e85b58e8913223b28836cdad44 SHA-256: 419507dab41dca9ed586bc3b43022ae2b0964beb71e98896c0a0500eea78c680
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains multiple external URIs, including one pointing to 'allytemp.ru', which is likely a lure for downloading malware. The PDF structure and the presence of numerous links suggest a phishing or social engineering attempt to trick users into visiting malicious sites or downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://allytemp.ru/uplcv?utm_term=whatsapp+update+version+download+for+android PDF link annotation
    • http://szamosiszerviz.hu/feltoltott/files/76436558707.pdfIn PDF document text
    • http://sissonne.hu/editor_up/xaduzug.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/dumozosedopizoribemabig.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/62507530351.pdfIn PDF document text
    • http://balbu.eu/uploads/news/file/lixubekira.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/44035468731.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/sedava.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/lemonipizuzegunapile.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/jejozufaravuxulid.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/sixifutevovunulaw.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/menitilimisir.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/duvagofeluxolejizobidiwav.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/xeban.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/72978689135.pdfIn PDF document text
    • http://cftckr.marketsearching.com/upload/files/31687224166.pdfIn PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/63027321790.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/folefomazomo.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/26535778660.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/6uisp5081h72emm2km30rllh08/xenileduveru.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0604c8467---xofixuruluwutuv.pdfIn PDF document text
    • http://vce34.ru/attachments/file/65929991635.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/bufomanerigodi.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/23844282184.pdfIn PDF document text
    • https://kiptep.ru/file/51079689.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/13546494168.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/xefefiwozoxixivibi.pdfIn PDF document text
    • http://ms-domino.eu/images/file/files/pakowigidaxofate.pdfIn PDF document text
    • 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_off0000b62b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB62B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE3D 15000 bytes
SHA-256: b972e924b9cd9c2f40346f0bfdc36e0ef94fff51b199680a1d13db27c886673a
font_02_sfnt_off0000f487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF487 10840 bytes
SHA-256: 51ba5e41b01f5764bf963ae660eb700db1e9cbc4ffd3579d8cf7e717c89ce544