Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff9620ae611a030d…

MALICIOUS

PDF

89.5 KB Created: 2021-09-08 20:33:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 498988b6e8a017c7d1379d4c949bb957 SHA-1: 6c620fd6a085d9bb62dbc8faed04eb11c4092418 SHA-256: ff9620ae611a030db6f29facc0077cec6f509ab6321136aab0a4dce940f63d12
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript points to T1059.007, and the overall delivery mechanism is consistent with T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://imhyuk.com/imhyukeditor/userfile/file/35120127873.pdf In PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/5142239188.pdfIn PDF document text
    • https://etevent.itweald.com/uploads/files/6138df39ea32c.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/40242161962.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130603b88986---zusubariz.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/javebidepeb.pdfIn PDF document text
    • https://jgranit.pl/userfiles/file/25778235522.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/gevupuxakijimar.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/90810861384.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f5ceaf5a4---31287101101.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/85063082029.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109050231471870.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/27206174920.pdfIn PDF document text
    • https://emtracing.net/userfiles/file/dukigewufemejezib.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/44784260591.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/16080315246.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/xifizamuxowigupududejoxut.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/74192604333.pdfIn PDF document text
    • https://o-dance.com/upload/files/xukususitumi.pdfIn PDF document text
    • https://jin-ji.com/upload/files/pelaxotexojoveli.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/28611452319.pdfIn PDF document text
    • http://mybed.tw/uploads/files/202109070925264598.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/solisexabiwomide.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/6949634557.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/55829630406.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=geekvape+aegis+mini+kit+manualPDF 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_off0000f4bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BF 19520 bytes
SHA-256: 71d48d293564420d0d76a501067cdf18871dfdbe414a3aff41eec7424972bc2f
font_01_sfnt_off000127ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127AD 10672 bytes
SHA-256: 98c22504c26e0419bd46a5b6b749632e4dcea9f453b4b88bcd18b10df93c105f
font_02_sfnt_off00014031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14031 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1