Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e4707500e063e90…

MALICIOUS

PDF

81.4 KB Created: 2021-09-12 04:10:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f72aa5f1b245c38ce65c24616c74489b SHA-1: b5823ba8f43cc702c33707d7d1cfe3c6c661f92e SHA-256: 9e4707500e063e90402f701bd6ab6ba550b9a3e765554155cb8e55476946972d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URLs, indicating an attempt to redirect the user to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of a link farm on disposable hosting further supports a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pistant.ru/uplcv?utm_term=icloud+on+android+photos PDF link annotation
    • http://av72-reklama.ru/userfiles/file/163051538342d0f7ee600116ffc6b2.pdfIn PDF document text
    • http://cdenito.net/userfiles/file/kizevoso.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/98108573230.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/zanewibutob.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/sibuwisevorasogafilovaja.pdfIn PDF document text
    • http://askaudit.ru/price/mibetekowitinuxuvumow.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/midipogulemubizil.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/33804793258.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/23cd8d7e293dd2f0fecbd57688b46baa/pusimobaxoniteg.pdfIn PDF document text
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/13187736314.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/47647797961.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/95961604354.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/5771949334.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/29470362095.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/161351a04133da---kodebawofepubofisade.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/99209717336.pdfIn PDF document text
    • http://shangyi-pump.com/uploads/file/032218469331.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/28361341173.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/nofakuj.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/rufajanilomomipe.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/2553038901.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/ladexomegafelanagiwe.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/botedotokefoseji.pdfIn PDF document text
    • http://photo-ostrov.com/ckfinder/userfiles/files/govajilorezoniwili.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/9000117731.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_off0000db3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3F 17380 bytes
SHA-256: 317fd7ab721fd2bbe332400de92bd9719175bc962d8a0885e93c5a07d0ef988c
font_01_sfnt_off000107f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F6 10532 bytes
SHA-256: c97b04889f6de512544b116f33561d0344e8bea15f87cb60d45f972c40a6f75d
font_02_sfnt_off00011fdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1