Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cd1a333828e97bf…

MALICIOUS

PDF

80.5 KB Created: 2021-09-12 13:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a33ffafedc4cdd9d9060a79694dae921 SHA-1: 1c653c94d9ec3b3533a1888fbb04d314c7c29b96 SHA-256: 3cd1a333828e97bf1d9379c559da61bea7528f162bdfc21268104e85ad478329
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for delivering malicious content or redirecting users. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and the numerous extracted URLs suggest a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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=furniture+for+minecraft+apk PDF link annotation
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/wukiwepofabukaku.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/33396106514.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210906065303.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/60101465342.pdfIn PDF document text
    • http://hwangtosidae.com/userData/ebizro_board/file/timojusodegoditekazi.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/25767012313.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/94145214490.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210909180710.pdfIn PDF document text
    • https://tessuno.com/upload/files/61377b81dd6c7.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/madiwobakuvifibisuj.pdfIn PDF document text
    • https://kawanmto.info/contents/files/juwagojuwanitiki.pdfIn PDF document text
    • http://tochalco.com/uploads/files/nozujuzijegenanikelipobik.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/91821077743.pdfIn PDF document text
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/vilogoronalud.pdfIn PDF document text
    • http://www.sctiec.com/up_files/FCK/file/lowefapuzujesewuwi.pdfIn PDF document text
    • http://maudchristan.nl/ckfinder/userfiles/files/lojenavebidopufef.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/rozejedapaguzufewofa.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/17439146069.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/78230657811.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613335a486ff0---25828007556.pdfIn PDF document text
    • http://image.dlib.vn/libedu/news/bachviet/20210912/file/siwagimatifovawotu.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/88413855253.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_off0000d790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD790 17336 bytes
SHA-256: 727483c5a462d78a823faf96039797d7ca8af297464a954fce8501af6db8f5da
font_01_sfnt_off0001045d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045D 10596 bytes
SHA-256: c9bc9b1a3713f53ec095e8a6652738d583bbf52e439317d2cb7bdbd64c9abfd9
font_02_sfnt_off00011c92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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