Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c7a421a6d7ccff9…

MALICIOUS

PDF

83.4 KB Created: 2021-09-12 06:02:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8a0f6eee3362a64add0195af96ae39dd SHA-1: 0835b9d23b53d9b73843695898dbd8ac6dc4f4c2 SHA-256: 1c7a421a6d7ccff9ee6b179d9bff4b2e16b9da665ab0c13766ac3d2b8d4f35fb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains a link farm with numerous URLs pointing to various domains, suggesting an attempt to distribute malware or phish for information. The presence of a 'how to download gta v no verification' URL further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kmkonsult.cz/userfiles/file/33808238646.pdf In PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/gokotovap.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/88391982665.pdfIn PDF document text
    • http://wsospice.org/uploads/userfiles/file/file/52963763587.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/jasoke.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/57867904094.pdfIn PDF document text
    • https://digicpictures.com/downloads/9803360132.pdfIn PDF document text
    • http://villacappuccina.com/userfiles/files/28559073596.pdfIn PDF document text
    • https://searchlink.org/userfiles/file/vutelilefu.pdfIn PDF document text
    • http://abpjseah.news-read.com/upload/files/31334826106.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/sarade.pdfIn PDF document text
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/59047138033.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/vatevejabidudejodazeko.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/56179123219.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b304d7dbf---bagufibekokexisuzigenu.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/kuwaruxugetubomowosobujen.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/91873959443.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/70626889940.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/20858093301.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/xitoxunu.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/vipinenirevejonesokeles.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/29443525628.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+download+gta+v+no+verificationPDF 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_off0000e0e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E1 18116 bytes
SHA-256: 93bd5f28ce18f4b298882dda80fa009ce45f002cb657b7dbf01d5328c21401db
font_01_sfnt_off00010f68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001277f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1277F 10624 bytes
SHA-256: 0bdff5b54f891b0b47cdcf1cfa421a3d15130cc4b6dc5861ce6fad02279c1b84

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