Malicious PDF — malware analysis report

Static analysis result for SHA-256 37a432c048b2c521…

MALICIOUS

PDF

76.8 KB Created: 2021-09-14 05:32:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5e893fdf0eeb5ba5eaf70d91cf3c70fa SHA-1: aeee942a2d4d64f7964cba70f62e4fb8b1b75443 SHA-256: 37a432c048b2c521bfe9a3ea239fcbcbcc6d7227252063e6966f65ee7ee50854
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic 'ML_NYX_PDF_MALICIOUS' and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to numerous external URLs, as evidenced by the PDF_URI and EMBEDDED_URL heuristics, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://ketchas.ru/uplcv?utm_term=car+mechanic+junkyard+tycoon+mod+apk PDF link annotation
    • http://unseretochter.com/images/file/foruro.pdfIn PDF document text
    • http://leadingedgecorporate.com/user_images/file/21676396414.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/wowawaxusowomiba.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/40660761281.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/javaras.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/6514193421.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/tufimekepuvaraseliwopu.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/monag.pdfIn PDF document text
    • http://ls12368.com/userfiles/file/54025640297.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/22888429638.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/kinosuw.pdfIn PDF document text
    • https://limsurempat.com/contents/files/5633505683.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/juvenume.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/66665924630.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/lefos.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/90431066684.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613e291011365---lajijomasas.pdfIn PDF document text
    • https://ratodua.com/contents/files/98716061999.pdfIn PDF document text
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/53174896802.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/gaxofovo.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/37594305352.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/sataxezuvobejetalazixow.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_off0000c793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC793 17272 bytes
SHA-256: 8afcb024d21cd007e5839b0c79251c854e947433916be781f9e317a68214478f
font_01_sfnt_off0000f3e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E4 11032 bytes
SHA-256: 72eb3db6242dbadae55e04a9a43b338b00022fdc445efbf009338d2ec0c967df
font_02_sfnt_off00010d5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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