Malicious PDF — malware analysis report

Static analysis result for SHA-256 38557c983a8aa33c…

MALICIOUS

PDF

80.0 KB Created: 2021-09-26 18:06:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6346fef891a48edd632ff180b36ea218 SHA-1: a42c896cf982049c6c52571f29ff9478d3c9a227 SHA-256: 38557c983a8aa33cbbb95a67c895959738487b726f66cb34bc284f39f5c90db3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is a common technique for executing malicious code or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://siam-royal-view.ru/data/files/nupizojida.pdf In PDF document text
    • http://dataction.org/demo/dataction/media/41415784049.pdfIn PDF document text
    • http://jyy.jp/ckfinder/userfiles/files/20210921_033444.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/pupibinipixituvov.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/76919053397.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/gufukesetubom.pdfIn PDF document text
    • http://stevis.cz/files/file/xemewevisisev.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/67733640788.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/29677291417.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/xogapamizunufurezubofabom.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/56592839944.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/aarc58s333290a8n1r6r3ad8d1/10927637787.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/fotamoxegomu.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/74014688208.pdfIn PDF document text
    • https://triosms.com/userfiles/file/difena.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/80640348895.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/nagenuvizalupupuditiv.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/42499989921.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/toladogid.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/jifixafukizukinaw.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/76063327848.pdfIn PDF document text
    • https://xn--atpta-nfb.lv/images/userfiles/files/newazomo.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media/85491981291.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/84626259986.pdfIn PDF document text
    • http://f1-rennsimulatoren.de/userfiles/file/17991374415.pdfIn PDF document text
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/tulonikoxenudidu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=alfabeto+ruso+pdfPDF 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_off0000c718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC718 22524 bytes
SHA-256: 413c482356dbc25c2c9a64894b89289587e9e496100c0a023ffed432053b6628
font_01_sfnt_off0001010e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010E 10516 bytes
SHA-256: 4270a357e3dac57c2f5c1ef090e5aebb585f02c06e6281d0f0427a35d61372da
font_02_sfnt_off000118fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1