Malicious PDF — malware analysis report

Static analysis result for SHA-256 8464f12291ff679e…

MALICIOUS

PDF

69.1 KB Created: 2021-09-26 11:38:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 17396ba87ca5384f3390c7339f9f3b12 SHA-1: 585347db2b8d9f005fc4e8104156cdc3d82ed046 SHA-256: 8464f12291ff679e57445c70e18c4c7dd19f5b751883c037d5fbc06e9c231280
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous embedded URLs pointing to external sites, with the primary purpose of directing users to potentially malicious content or phishing pages. The presence of multiple disposable hosts and UTM parameters suggests a coordinated effort to distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/libuxekutofaxulabul.pdf In PDF document text
    • https://thuhuonglacquer.com/uploads/news_file/18947896900.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/61460751596.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/zibobof.pdfIn PDF document text
    • http://naylorrealty.com/userfiles/file/17359285243.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/84664724676.pdfIn PDF document text
    • http://synhbio.com/upload/files/64148930206.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-24/20210924225351839475.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/17185140722.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/mujup.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/54228511749.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/8710773901.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/zimasebuvolorat.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149ea9837936---kivaweloxenomonon.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba2806838c---pevejekedepunonalugiv.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/ruvozudataxe.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/45861142371.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/bopuxegufasanowo.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/43932246153.pdfIn PDF document text
    • http://enewind.com/pliki/file/24326168688.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/09/202109020451415893.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=instagram+gold+mod+apkPDF 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_off0000af64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF64 10552 bytes
SHA-256: 76be1b85ced40d401b8d33c365071b25005cc2763fae21c61bc899f4edc6fb7a
font_01_sfnt_off0000c735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC735 15676 bytes
SHA-256: 39cea23ce9d99ae8871c9dbb6bb13b3acc6e2a064961beabd7364fdc466f5c27
font_02_sfnt_off0000ee9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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