Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b754f0390e46b2c…

MALICIOUS

PDF

80.7 KB Created: 2021-09-21 19:43:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 872d7a99473f8334d35b16b977a4fe0e SHA-1: 293134c7d82047a74dcde1df6e6262e19a516b7d SHA-256: 6b754f0390e46b2cc76e201ae14ac01c84528c298ef56cc17d367a379eb60b78
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URIs, many pointing to disposable hosting, and is flagged as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing or trojan delivery mechanism. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may be a pretext to trick users into providing a password for a subsequent download, which is a common tactic in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • 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://philabc.ru/uplcv?utm_term=how+to+send+files+using+wifi+direct PDF link annotation
    • http://185.33.116.142/~bbyacht01/upload/files/29446269485.pdfPDF link annotation
    • https://pasationtravellers.com/root/FCKeditor/file/84006861663.pdfIn PDF document text
    • http://henca.com/files/details/file/95851483203.pdfIn PDF document text
    • http://kaitianjinghua.cn/admin/userfiles/file/202109040727261014.pdfIn PDF document text
    • http://stroyindustry.com/userfiles/file/linupevuw.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/77681881744.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/8681329586.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/gorinogajuzipiroriguloxuz.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/sovezulelokebitusarilet.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/gizubapigowotisekipov.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/94332707248.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/30860368168.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/sivuzexuxemujerefabak.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210919_042408.pdfIn PDF document text
    • http://mueblesdepladur.es/1/userfiles/file/56907012226.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/71606968359.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/xiveletipajisepad.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/xawelesezanujubupuku.pdfIn PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/lunimibajuza.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/58391700292.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614350c971395---37874944957.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/ce0c7c519e7b6a51eee20c8a24099e71/fiviladotekadimaxaxikuta.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/1088694411.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_off0000d81b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF032 10664 bytes
SHA-256: 37a6043509de74ad0316a2b439e60db20e0827c0c7288dde59aee06badf6af2a
font_02_sfnt_off0001088c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088C 17144 bytes
SHA-256: bad6375657c25d9202d40b17526880279cb1105757c3c2503937b91fd5dd248c