Malicious PDF — malware analysis report

Static analysis result for SHA-256 90b89e11626322a4…

MALICIOUS

PDF

69.9 KB Created: 2021-09-29 05:28:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 456f76d0e28dba644bcbc5f61441fb6c SHA-1: 6147ba7d44e210b2f924fcd55de6b6f1144a47e0 SHA-256: 90b89e11626322a43c3ce9635112f259b8343d8c031c37f2b7e22283f698abf5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. The heuristic 'PDF_IMAGE_LURE' indicates it's an image-only document with an action trigger, designed to resemble a screenshot to entice clicks. Embedded JavaScript streams and numerous external URIs suggest an attempt to redirect the user to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://xatrbio.com/userfiles/file/44340369669.pdf In PDF document text
    • https://safetyhanoi.baohohoanglong.com/userfiles/file/72177918547.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/jedutulawuserafotuz.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613f43385fb9e---30579851167.pdfIn PDF document text
    • http://minhquoc.vn/ckfinder/userfiles/files/zarasu.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/dotegukaw.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/vatadume.pdfIn PDF document text
    • https://osakadentalcare.com/contents/files/59259810685.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/61962549562.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/33864844614.pdfIn PDF document text
    • http://craft-personal.de/userfiles/file/pijuzominotuxumaniwo.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/gijogorezitupil.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/68297339121.pdfIn PDF document text
    • http://turchifiltri.com/userfiles/files/zenapulifesosizi.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/tujomazewi.pdfIn PDF document text
    • http://salwex.hu/file/mopizowunofe.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/jowemojexanudekopi.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/pomanirafipowakulenulo.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/81962497661.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16147afc06b029---xigotawaxifagemarigi.pdfIn PDF document text
    • http://cserepakcio.hu/xdata/file/87418796986.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/taxebejodatibizipibedavav.pdfIn PDF document text
    • http://h04ydivan.ru/userfiles/file/rijufamujabiko.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/mitodametebe.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/59881803025.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/80604794398.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=strike+force+kitty+2+downloadPDF 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_off0000b46c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB46C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC7E 14492 bytes
SHA-256: 813695ae328c20943c880390f9e36da361b18d11604877b4bdfd62e461850371
font_02_sfnt_off0000f0a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A9 10788 bytes
SHA-256: 54d668ea3543641a0a17b84f6c77e7b191d40ea23ee0f808834cc08a62f48dce