Malicious PDF — malware analysis report

Static analysis result for SHA-256 e07b30c5d0895ed2…

MALICIOUS

PDF

70.2 KB Created: 2021-10-02 14:53:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d4bb6f8a554f732b6ee300c7ff7f0c8a SHA-1: 5f62afcae8e7654348d5dcf09673ad45f0794083 SHA-256: e07b30c5d0895ed2302ef6939e378a51304783c912d8868ed4e4961392d3f8ad
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous unknown URLs suggest a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead users to malicious sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://marisqueandopremios.com/campannas/file/zaworoximoreza.pdf In PDF document text
    • https://vicareyou.com/userfiles/file/35948690419.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/puliluwexugaw.pdfIn PDF document text
    • https://ksdc.in/userfiles/file/zitenegakebumumaw.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/41536580284.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/47654196782.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/95869925811.pdfIn PDF document text
    • https://otterdisplay.com/userfiles/file/47299468293.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615570f97ba02---lamudosidudikax.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/mefokomisotipigunejide.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/43952505639.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/lupogaba.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/69671631036.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/xebuxadaxuvutomonizurif.pdfIn PDF document text
    • http://autavrabek.cz/obrazky/file/sovevokawijuxev.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/97664541805.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/zepurifobebuka.pdfIn PDF document text
    • http://hebakotb.net/userfiles/file/daxefadelomemibup.pdfIn PDF document text
    • https://borsalino.ro/imagini_ws/51572720763.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/35329326459.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/30790170871.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/gutiladiniwojasiw.pdfIn PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/bugelowewowopusipipa.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/kegixuxatasovikul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=marked+by+the+alpha+read+onlinePDF 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_off0000b194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB194 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A6 16140 bytes
SHA-256: a10862f5f7a22513799790684c1223bde80b0682c9348fd78f22acbb4f1516ae
font_02_sfnt_off0000f2c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C3 10660 bytes
SHA-256: 459e8f6f0f049300e220804799e9287fd4bd8be2d6bb79ab7880793f24814945