Malicious PDF — malware analysis report

Static analysis result for SHA-256 efccb75278bdff34…

MALICIOUS

PDF

82.9 KB Created: 2021-09-18 18:18:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 3f9cec181c9022c3d96190f61f437d6c SHA-1: 1d6cd8b01ae88b4790bd8eac9b9c423ff0d444c6 SHA-256: efccb75278bdff34fedf5ffd18567e13e367f65c1aa5f4988582e14905d1e9f9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, suggesting it acts as a lure to external sites, potentially for phishing or to download further payloads. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea of a link farm used for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://aftaplan.com/works/peepsparty/html/upload_files/file/95375522044.pdf In PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136648bc892a---2302670538.pdfIn PDF document text
    • https://netpage.info/userfiles/file/goxebamadoxuzutajoturesop.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///202109167317_259125829.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/79232482491.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/45848481614.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/29005948234.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sefaxenibedebirisudetomub.pdfIn PDF document text
    • http://szwygs.com/upload/94165454618.pdfIn PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/nuvakivelikivawef.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/10726589589.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/nawaxupukosukogepuk.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/vanowake.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/60236862647.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/wonufirulul.pdfIn PDF document text
    • http://kindergartenhelden.at/upload/file/21958271476.pdfIn PDF document text
    • http://thevalleytrader.com/files/75525689941.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210913155222_3gaika.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/70585179250.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/16696793181.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/93711324765.pdfIn PDF document text
    • http://paradoxine.com/upload/files/54738522966.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/429292a9c3581364e1471878a7310cf0/vasesuvogizafinurofibin.pdfIn PDF document text
    • http://vita24h.com/uploads/userfiles/file/33302998625.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=download+game+tarzan+ps1PDF 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_off0000de7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7F 17652 bytes
SHA-256: ec8b27466a6a412d4773be87bdb9682fa54742d97b8255e4754298bd67a35656
font_01_sfnt_off00010c8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8C 10844 bytes
SHA-256: 9af81c4e18dcb17080b0ffa27890e3602f7555a21a23be8ac1f91800188d5b73
font_02_sfnt_off00012587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12587 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1