Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce6af1c5a3c78239…

MALICIOUS

PDF

73.0 KB Created: 2021-09-26 07:26:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 60ca2a205e5cd5b74ebe7eeb3dd398ec SHA-1: 82ce5b806766896f13b9c1344340273bd1a34980 SHA-256: ce6af1c5a3c78239c690fc2034e779aa0addb2ead317a0c9688e031b5fde8b13
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and numerous external URLs, many hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://smidgel.ru/uplcv?utm_term=devil+may+cry+pinnacle+of+combat+apk+download PDF link annotation
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/radovugudonime.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/35647929767.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/vavadatexeloxoduxu.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/69115590106.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/98841146030.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/ca24q69p48kr5t70rko696o2sg/73076775861.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/58076141774.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/45452200454.pdfIn PDF document text
    • https://pokereshop.cz/data/file/sewutilixusixekolagenilab.pdfIn PDF document text
    • http://iacsglobal.iacsinfo.org/content/uploads/files/6308398263.pdfIn PDF document text
    • http://xfswchem.com/upload/files/84335665718.pdfIn PDF document text
    • http://ridendo.cz/files/file/dutugajedugabopan.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/8027527656.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/40578818701.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/dutubefolupofesar.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/30153179258.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/viwejasaxidali.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c99883ac53---demapafuruwipesebata.pdfIn PDF document text
    • http://ultrabeauty-ff.ru/userfiles/file/29884482128.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_off0000b09e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB09E 11112 bytes
SHA-256: b48ff21fbcedbba5370d116b51f67c637213f5153fdba6155e369ce8d9bbaa91
font_01_sfnt_off0000ca5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5A 20156 bytes
SHA-256: 31632cf4a1609791a41ab8880b90e9f902039740a2ac8d03d2e02b39301fafa4
font_02_sfnt_off0000fe7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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