Malicious PDF — malware analysis report

Static analysis result for SHA-256 773b311ac7a98d33…

MALICIOUS

PDF

82.4 KB Created: 2021-10-13 06:30:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0cc08b7cb09b572dc2f44ea48211d667 SHA-1: 756b7998cead994e84f60962ec82c367a5945668 SHA-256: 773b311ac7a98d3366a2e12808958c56378d060ba5987ff8cd7d367d78c23bd9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by multiple heuristics, including ML and ClamAV, indicating malicious content. It functions as a link farm with numerous external URLs, many pointing to unknown or potentially malicious domains. The presence of 'utm_term=dog+sexy+pictures' in one URL suggests a lure, possibly to distract from the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://hiperaktivite.info/userfiles/files/38450281367.pdf In PDF document text
    • http://hyeminshop.com/DATA/files/toseda.pdfIn PDF document text
    • http://mirsistem.com/depo/sayfaresim/file/kepuno.pdfIn PDF document text
    • https://coverline.ro/userfiles/file/76508137664.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/mizukajavonorikazivu.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/xinopufibapomokosi.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16141b31cd0f4b---kexakimavowexurukadig.pdfIn PDF document text
    • http://melodylavernebettencourt.com/media/file/44980711070.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/walumiminezakumimugi.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/fizopapemexaxinuzof.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210921_6F739ACB35E0DFE0.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/tumif.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/61824338786.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/23587583026.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/suduvumupobepanemoluxe.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/86545562144.pdfIn PDF document text
    • http://svx.su/ffile/file/wuzunoxukesameturanu.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/vcs95jmccauanq3bgj89oih201/fuveduxuwadepewalaxonos.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/49301929863.pdfIn PDF document text
    • http://eshop-kocicinadeje.cz/files/file/josuvefazazubiwibedixes.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/wigozadagupoberelineti.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/RhDyTiV0TgQ/uplcv?utm_term=dog+sexy+picturesPDF 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_off0000dd19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD19 18232 bytes
SHA-256: 23b4e52c80fbea5e488a1065769901d75c5f368e7faaef5c05248d5da7cae94f
font_01_sfnt_off00010c55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001246c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1246C 10552 bytes
SHA-256: cc5756179a439dba2e7e14b5700221fa13a5a7b6677b24cb97ef7e468e6b69c3

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