Malicious PDF — malware analysis report

Static analysis result for SHA-256 79208fd119660084…

MALICIOUS

PDF

89.3 KB Created: 2021-09-20 16:33:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: bba586c11a44a9fc28e858b1793a6422 SHA-1: 15bc81a38f7693c88a6128b2525dc912fc26a59a SHA-256: 79208fd1196600848f243d46696c7c993acc5b308dccd770601d9ff409b148c0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, with high confidence. It contains embedded JavaScript, which is often used to download and execute further malicious content. The presence of numerous external URLs, many pointing to potentially compromised or disposable domains, further supports a phishing or malware delivery scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161430841d0d7f---37947182691.pdf In PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/valinoko.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/nezugiwexulofe.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/wedaseru.pdfIn PDF document text
    • https://pokereshop.cz/data/file/42029019816.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/gegemaremafubifefafaloxi.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/rirapenozofipuxawekar.pdfIn PDF document text
    • http://space-edge.com/upload/files/jivudo.pdfIn PDF document text
    • https://listocrm.com/userfiles/files/kevuzera.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/vatabilegosameri.pdfIn PDF document text
    • http://pro-roubenky.cz/UserFiles/File/70642706886.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210910095314032.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/zujokakibog.pdfIn PDF document text
    • http://dkind.net/userData/board/file/19158745759.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/soriselez.pdfIn PDF document text
    • http://hkalc.com/userfiles/84762473408.pdfIn PDF document text
    • http://dytac.hk/userfiles/dulisekewav.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/82a3397935abad77c18cf668195f193e/tisimutitonujepol.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/sajuremoragapifosoxebi.pdfIn PDF document text
    • http://szigmetal.hu/editor_up/vipopilokewoko.pdfIn PDF document text
    • http://lienming-rubber.com/uploads/files/202109200023074308.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/zafug.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/41451394936.pdfIn PDF document text
    • http://ashioke.com/images/library/File/nitofotivekaxadokejobon.pdfIn PDF document text
    • http://metalzilemboeventi.com/userfiles/files/99525850047.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=medicamentos+de+patente+y+genericos+pdfPDF 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_off0000f5c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010dd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD8 18744 bytes
SHA-256: 7c09d2d7c1def42118b117a4f740940fd232c17aaa8d9cc7d5e7ac6f04c9bdaf
font_02_sfnt_off00013dce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DCE 11024 bytes
SHA-256: 79f085c4adafc964fbb56ce5294db1a3669c68b60d9b14b987a4510ab14373e7