Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcaf19517dd6be17…

MALICIOUS

PDF

70.9 KB Created: 2021-09-19 03:18:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b45da9f7f689ca09dd24ca22fa5534af SHA-1: c40e52f935ac6cf76cbdb69ef019a9af0c5cd181 SHA-256: dcaf19517dd6be1786fb42ab5820bdf435af1c8162b8ffd6dadeaa47c3cfecea
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, with heuristics indicating embedded JavaScript and external URI redirection. The PDF contains numerous links to external domains, suggesting a phishing or malware distribution attempt. The embedded JavaScript stream is the primary mechanism for executing this redirection, likely leading to a second-stage download or a phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://whkmradio.com/userfiles/file/wexejosa.pdf In PDF document text
    • http://autostyle-japan.com/js/upload/files/bumikowutebaxonigo.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/18010204853.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/kepobax.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614663f5d15d6---tajirezonopibu.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/99506863831.pdfIn PDF document text
    • https://thebillionbottom.com/business_school/uploads/file/gikulin.pdfIn PDF document text
    • https://divetechmarine.com/contents/files/87279256634.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/wobivawogexuzix.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/nomoliwijugifoviwiwebolo.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/38284861841.pdfIn PDF document text
    • http://puebloexec.com/userfiles/file/dufikololerizuwawexike.pdfIn PDF document text
    • http://eatoceanic.iorderfoods.com/uploads/files/66441159644.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/xifebumopetomulowo.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/mijexexitowen.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109030936309413.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/17451301110.pdfIn PDF document text
    • http://cukrarnakolbaba.eu/obrazky/files/95487165805.pdfIn PDF document text
    • http://taociren.com/upload/file/21091509510418750104zk5kchwvjc.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/6hap6d1tmb2hglhdl5t31tiusk/fejaxofemopesutilojog.pdfIn PDF document text
    • https://agatanorek.com/files/file/pugakan.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/54639953677.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/bewemisidotezodok.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/71799377406.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/3283421440.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109091527145262.pdfIn PDF document text
    • https://cantarefides.ro/admin/userfiles/file/40900602763.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=gta+san+andreas+game+download+for+android+modPDF 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_off0000b688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB688 10820 bytes
SHA-256: 292d729a434c9c9a5e00436475313b2c6053c57de56e9509287c742abd3dcede
font_01_sfnt_off0000cf55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF55 15080 bytes
SHA-256: 919ef980632b09af57d7e25ebc46504a2dc4cd5fc19f27f80a1b0db4f91df8f6
font_02_sfnt_off0000f580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF580 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1