Malicious PDF — malware analysis report

Static analysis result for SHA-256 8322b19041669758…

MALICIOUS

PDF

78.7 KB Created: 2021-09-17 06:57:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d11ed0f5aab2dd2d904b4e94fb9e9820 SHA-1: 4c6ad90f1cf5f5b9e00c32c817c727dbc5b47bcc SHA-256: 8322b1904166975878e2a9f640ce444407a0363e0e63cef6bf4db89e26a64389
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are part of a link farm hosted on disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a deceptive structure. The embedded JavaScript likely facilitates the redirection or further malicious activity initiated by these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://crewmak.ru/uplcv?utm_term=whatsapp+apk+download+2020+latest+version+for+pc
    • http://ekhoron21.mn/uploads/files/20269606664.pdf
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/48235364193.pdf
    • https://poganyvolgyi.hu/userfiles/file/73703194245.pdf
    • http://farmaciafoglia.eu/userfiles/files/13862859046.pdf
    • http://bischofs-scheune.de/userfiles/file/rowukatupamupa.pdf
    • https://smartstone.ca/userfiles/files/dunuma.pdf
    • http://www.yemany.com/yemfiles/files/93142208199.pdf
    • http://k-sta.kr/FileData/ckfinder/files/20210903_F47B3B2E88FF6E08.pdf
    • http://metalltechnik-kutschi.at/80787813517.pdf
    • https://ikincielinmak.com/upload/ckfinder/files/xasaravomojow.pdf
    • https://purefeeling8.com/data/file/ditemiririkituxevexajow.pdf
    • http://driver-jazda.pl/upload/file/73429820239.pdf
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/18039494061.pdf
    • http://khojedu.net/userfiles/file/zabita.pdf
    • http://werkkledingverkoop.nl/images/docman/files/92961123160.pdf
    • http://thaoduocvn.com/userfiles/image/file/tigepegimukoxexesojoveki.pdf
    • http://hantechwelding.com/userfiles/file/2021090521460573499.pdf
    • http://jikaramen.com/uploads/files/21941066644.pdf
    • http://aristosaigonhotel.com/uploads/files/lujidotemuke.pdf
    • http://www.biosafety.biz/ckfinder/userfiles/files/4981876512.pdf
    • https://jodhpurtravels.com/nbloom/fckuploads/file/18965979405.pdf
    • http://aweibel.com/Photo/file/96420822338.pdf
    • http://horizonpestservices.com/userfile/83735723834.pdf
    • http://longthinhphat.net/uploads/files/fiwan.pdf
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/5889878509.pdf
    • http://sarigol.kr/userData/ebizro_board/file/kebebolipixoxut.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cce1.bin
dffad2861f169b13152cffef30b274ae565b2f4ff6c4cee1630551a8e656157e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE1 17404 bytes
font_01_sfnt_off0000f9fa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FA 16792 bytes
font_02_sfnt_off00011211.bin
a34c3619d23ad9ace72c89dfdd9275d8799eb9e85ad9466aa1e5ec8390386386		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11211 11196 bytes

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