Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb17c3cf7daccaa5…

MALICIOUS

PDF

106.2 KB Created: 2021-09-11 07:59:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: faf3dcfbad554d428ddedb7889d566d7 SHA-1: 4c926d18ec1dbe5d778d300e7b0491219a57e291 SHA-256: fb17c3cf7daccaa5b388847143d2a25f780d05a6d6be4ec348b1c3e390d66d81
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://ecohort.com/userfiles/files/foxuxizag.pdf In PDF document text
    • https://pianotuningdarwin.com/userfiles/files/kupenavudujelax.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/44695208409.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/97339992930.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/tupafelufatowifu.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161360536a9883---98001556480.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/rifeviba.pdfIn PDF document text
    • http://nhadep30giay.com/uploads/image/files/vozosumatovitufi.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/depubawupatetaputugomu.pdfIn PDF document text
    • http://bhartiyambeohari.in/userfiles/file/riwebatogupirilenurozu.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/momotosikebifer.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/35715831383.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/kamuwukejajibizirojelimi.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/denedesagoxesovefuva.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/eairkpkks42moed4vcebrral9v/32537380243.pdfIn PDF document text
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/75954780405.pdfIn PDF document text
    • http://khachsanmyngoc.com/upload/files/kigebimexaker.pdfIn PDF document text
    • http://lmtechsolution.com/userfiles/rupijirerawidulepetavu.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/45258662968.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/vopukokodenixu.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/telonej.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/28212934726.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-09/images/files/jopavogovelejaj.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/dozetevabijefigetifu.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/xevovijalizotafuva.pdfIn PDF document text
    • http://leton.pl/userfiles/file/bozagiwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=project+free+tv+chicago+firePDF 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_off00013c3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C3E 10492 bytes
SHA-256: d120f0fffaf1b33aaeb20a37a535273bcc7006ec313262d8fdf14d5ebb424cc4
font_01_sfnt_off0001543d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1543D 18016 bytes
SHA-256: c6ed11b89ddbf33aa785669223063e1cf0a3bf5a438562fb009d07ad2d3618ff
font_02_sfnt_off000182ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1