Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c21bd172f14985c…

MALICIOUS

PDF

80.2 KB Created: 2021-09-22 18:22:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c378d8caae2d56f1b925e4c4d61cb0f0 SHA-1: ca86111e827db8b64a08142c5688fbb814ba79ee SHA-256: 9c21bd172f14985c1f09a27eecfee8cdb37879103952aa9317c9e94a34e67084
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, likely to distribute malware or conduct phishing. The embedded URLs, such as 'https://archism.ru/uplcv?utm_term=window+loader+for+windows+7+download', suggest a lure for software downloads, which is a common tactic for malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://archism.ru/uplcv?utm_term=window+loader+for+windows+7+download PDF link annotation
    • https://jotekonybakterium.hu/userfiles/files/vejumavidovubifutas.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/323f2d722df8821fa5bef8c01f9bb874/64728209501.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613521a7d9ed6---menomububafik.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/diwikenejunifulifugu.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/xuvokig.pdfIn PDF document text
    • https://cet.sk/res/file/pinivipo.pdfIn PDF document text
    • http://lollanaclinic.com/image/upload/File/rumulawusubo.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/majorulupavamatuxix.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/80730004810.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/julidamono.pdfIn PDF document text
    • https://shreenatharcade.com/userfiles/file/titibilidexupunawizuxamu.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/lamil.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/nebokajizurejer.pdfIn PDF document text
    • http://hotelrealerimini.it/userfiles/files/kavasolojogavuxulise.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210903_201252.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/55516907136.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/jugema.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/detexedunefesotal.pdfIn PDF document text
    • http://khocabien.com/uploads/files/volonuwaposawijatosi.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/gewidulogo.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/3033333028.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/44136980228.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/10623180348.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_off0000d7cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CC 16836 bytes
SHA-256: 1a6ecc5052df697322f7818f23a77deb7b4ce3d43373fa2daac159e75121a1c6
font_01_sfnt_off0001032d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B44 10376 bytes
SHA-256: f7f29ebaf96d0de1ce0f51cc1e85851705b4bad0a31812b3ecf90f3d7fa4b17b

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