Malicious PDF — malware analysis report

Static analysis result for SHA-256 544a1e3efd48b92a…

MALICIOUS

PDF

71.3 KB Created: 2021-09-21 11:06:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4a442428c61eeb0f4922cd0152fdfa9e SHA-1: c91ea9f4173c1483af8cd2b6831aaf6a6c26ccf4 SHA-256: 544a1e3efd48b92a7d721a116807e35291bdf70840d149af5655debf805ad445
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. It contains numerous embedded URLs, with one prominent URL pointing to `allytemp.ru`, suggesting a lure to a malicious site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed as a link farm on disposable hosting, further supporting a phishing or malware distribution intent. No scripts were extracted, but the overall structure and URL findings strongly suggest a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://allytemp.ru/uplcv?utm_term=8th+std+maths+textbook PDF link annotation
    • http://hkbroadwin.com/userfiles/13994399583.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/6ff8ebd252b2b54709071fc66afc796d/52937183685.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/molikuwifoxon.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/rixik.pdfIn PDF document text
    • http://nhungbaithuocnam.com/img-tvdl/files/86909473932.pdfIn PDF document text
    • https://tamphuctriland.vn/upload/files/99918929290.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc4a71c4d6---nudotazoja.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109072123597768.pdfIn PDF document text
    • https://vleek.com/uploads/files/80736609731.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/52888140830.pdfIn PDF document text
    • https://tomas-music.com/contents/files/kemilipopozen.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/68213392248.pdfIn PDF document text
    • http://pnlestari.com/visitbali/image/files/wenusuvir.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/12916537687.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/tipon.pdfIn PDF document text
    • https://esvigo.com/upload/files/nusakevetisexorafawib.pdfIn PDF document text
    • http://wyadonline.com/userfiles/file/34851552035.pdfIn PDF document text
    • http://dsagco.com/Upload/file/fidudozimipuvuruta.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/97756666980.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/57524339090.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/54939399906.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/fowejodomo.pdfIn PDF document text
    • http://wjcopy.com/upload/files/26856213299.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/rowakenanasemuruwemebi.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_off0000b412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB412 16760 bytes
SHA-256: 0f2fa97f06e6a8e6f54edf0c17717db11801c47870f2a30fa3319e460cd6db0f
font_01_sfnt_off0000dfba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D1 10616 bytes
SHA-256: 7ecf06561b95b67eabf50d427926d6ed784633f02eeab9db6d2b31dc8d6f77ca

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