Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b433e6416e77565…

MALICIOUS

PDF

84.8 KB Created: 2021-09-21 18:18:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e3e6a0ff022701e25225d3cf431ea181 SHA-1: a48c6fd583de3553c469d7fd1f632126176861f6 SHA-256: 1b433e6416e77565262a7d4e8cc01a220f10b1fcc79d37dc3a2e4fbcbba5d4cc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://coretry.ru/uplcv?utm_term=demon+slayer+movie+kissanime PDF link annotation
    • https://ntct.dz/ckfinder/userfiles/files/jokuwu.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/wuzikudajitujogabisu.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/33156394649.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/darazojowakaxojeludejo.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/81316622587.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/bixowotewo.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/40190984.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090604301318796.pdfIn PDF document text
    • http://skupka54.ru/upload/m/notufop.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/48040037863.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/52031969841.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/dipojimevasa.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/xovuxitawebubajinogu.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///bupijexevejefazukejidefo.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/kikumomuvokibazirifafute.pdfIn PDF document text
    • https://makenie.com/upload/files/44769023953.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/37818994025.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/mopelafedijigepe.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdd33dbeb9---57437057346.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/f1876bb26c98b01cd95836465cfe16a0/rimesabojon.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/87643539638.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/30197141836.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/bimumibewananupajusi.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/kepuwowetedowej.pdfIn PDF document text
    • https://asapcleaning.org/journal/hello-world-anime-full-movie-kissanime-bd9ab807/09/2020In 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_off0000e48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA1 18240 bytes
SHA-256: 5ac0e57dd7bc26c13b3cf2a7c0f13d9649c4b7b61abf44796ee860face7b05e7
font_02_sfnt_off00012c6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C6E 10444 bytes
SHA-256: c1aa9c4aab66fa05f50cd68f8a501bb9fc563a74006aeed98915addf6eda3294