Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed35593bd43e7763…

MALICIOUS

PDF

68.3 KB Created: 2021-09-26 22:58:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b875d2f559e3cbe444fa317bb34580f1 SHA-1: 3db5c7f12f7ab334e560e77b0b7708f41e00e27b SHA-256: ed35593bd43e7763af555423683e2f8616bd64cd024f0638b0ca9a15ebd0755f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it's an image-only document designed as a phishing lure. It contains embedded JavaScript and numerous external URIs, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, but the presence of embedded JS and the overall structure strongly suggest an attack pattern involving redirection to a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 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 https://palet-school.com/files/files/wopetixutij.pdf In PDF document text
    • https://brs.jo/userfiles/files/xiborexemodibujaneputeziv.pdfIn PDF document text
    • https://korankertas.com/contents/files/52167554973.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/kiwobuz.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/87138239900.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/jovitadatetatotu.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/xonutidabuberesuwo.pdfIn PDF document text
    • https://fabriziochessa.it/userfiles/file/jelidanabuwajob.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/34009687826.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/dujan.pdfIn PDF document text
    • https://oldd.adventurenetbg.com/userfiles/file/zezorisisetinizodugofek.pdfIn PDF document text
    • http://inistor.com/ufiles/files/54709953000.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139265b3af06---8029674116.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/ferovebu.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/dukalaburilomujafotofizi.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/volol.pdfIn PDF document text
    • http://grupafurman.pl/!mag2011/userfiles/file/87085123056.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/11321427225.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/42090870383.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/13268804089.pdfIn PDF document text
    • http://mlsconsulting.net/cms/files/File/78004153702.pdfIn PDF document text
    • http://119pump.net/d/files/39362600080.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/puzesulipiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+unlock+android+phone+from+computer+without+resettingPDF 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_off0000ad52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC569 11336 bytes
SHA-256: 1134c21bbbadaf29ed741cadeb0e65dd5ddc12a24b9995c97365218b431c1d36
font_02_sfnt_off0000dfb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB5 14220 bytes
SHA-256: 6de2858de84b81a74922f2dac876beae71e288b30fe12e23fd1d957df3485a02