Malicious PDF — malware analysis report

Static analysis result for SHA-256 88a410ee685634e3…

MALICIOUS

PDF

81.1 KB Created: 2021-09-22 10:02:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8bcb7a446082aa498a92aa5f8a0b02df SHA-1: 2692399a0f34eb6fd5b1c8174934f61c344d6a06 SHA-256: 88a410ee685634e319d157577e8e678b8efdc34197a19bb34d1439e451b39f94
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. It also includes numerous external URIs, with one specifically pointing to a URL containing 'ingramer+video+downloader', suggesting a lure. The PDF structure and numerous links to disposable hosting indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://catamma.ru/uplcv?utm_term=ingramer+video+downloader PDF link annotation
    • http://zzzwchem.com/upload/files/rokavema.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210910134316.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mupagiveben.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/jevumajaxafonizapaxu.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/ripakedufi.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/lurew.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/47999216950.pdfIn PDF document text
    • http://flairpens.ru/uploads/files/61535663823.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/37738315657.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202195101535660.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/tosajosexevafovesoxiwufa.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/74538465142.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202109110932296420.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/40685863540.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/sewejexividejizinalexi.pdfIn PDF document text
    • http://vocal.bpv.su/content/files/files/mafitewirojos.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/xodilupaxipidupogolorid.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/27547063256.pdfIn PDF document text
    • http://archbot.pl/files/file/zepozejevafuserosebu.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/e16f57ae59396a30fa44ad2234faf46c/gimuwexosel.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/23335172910.pdfIn PDF document text
    • https://bepcongnghiepphuchung.vn/userfiles/file/lelozabo.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7e4b64fcd---33586549227.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/logoderonijewe.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_off0000d9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B9 10428 bytes
SHA-256: f38b127a826e906ad7216628f325fe120bc09a38e1e5016927f6f74de48cacd5
font_02_sfnt_off00010919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10919 17616 bytes
SHA-256: 5a51b3f86fcc36809050135853889bedaed7dfb1846fc4f409c56d0ac3c433eb

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