Malicious PDF — malware analysis report

Static analysis result for SHA-256 852a224e1e4c5048…

MALICIOUS

PDF

68.3 KB Created: 2021-09-27 21:12:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: a95a883f91e4c9b2a190aba0f33865bf SHA-1: 4575f2b80c5138afc336c77090d30a7f62134c54 SHA-256: 852a224e1e4c5048e85638a8d94e16cb056aafc349e4f200ea2c3427503d4da6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external URLs, many pointing to disposable domains and employing UTM parameters, suggests a phishing or scam campaign aimed at redirecting users to malicious content. The ClamAV detection and ML classifier further confirm the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://nomylo.ru/uplcv?utm_term=reboot+loop+android PDF link annotation
    • http://grafitym.kz/files/file/jaregipulapuje.pdfIn PDF document text
    • http://www.polni.si/Images/files/fekuxifiwobobizibusum.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/37225781039.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfcaaad695---gikifuvavepukumujav.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/gilaf.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1632129171.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614721273d5a4---9370056722.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/tewufuwimomogajafowu.pdfIn PDF document text
    • http://aguito.madteam.net/ckfinder/userfiles/files/88213747815.pdfIn PDF document text
    • https://nycsmindia.org/ckfinder/userfiles/files/26230044041.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/47959041012.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/wuluvaporifun.pdfIn PDF document text
    • http://derp74.fooden.com/UserFiles/files/28820642205.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/nutunuxuzebebez.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/buzuzuzoburifanowux.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/nixiwexetunoxi.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/74998929785.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/nulakiwafadopox.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/fubetelibefokaposazexiku.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/zebimafezup.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/27883508829.pdfIn PDF document text
    • http://bixenony.com/userfiles/files/xuxalitad.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_off0000acdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACDF 15612 bytes
SHA-256: 39a2e2e0e4e6d7e79dacdb6468c224050c3f8c00c5b4cb84ef3e9b7c3e5414ef
font_01_sfnt_off0000d4aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ecc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC1 10404 bytes
SHA-256: ec44efb8189ba7689fa783d7ebf079da65b3a55beda5a85912db53954808e95a

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