Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8f20aebcc02ae29…

MALICIOUS

PDF

68.9 KB Created: 2021-09-28 09:15:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a67af179db7773cfb2fd59593d7efc7a SHA-1: 8f3fe480135f41263369d4e105c43e93f5659e1f SHA-256: a8f20aebcc02ae29f569204e71cfa15164e9dc71852db0631448c34bb7df7911
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous embedded URLs, many pointing to suspicious domains and some forming a link farm, suggests a phishing or malware distribution attempt. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

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 http://www.ufolep-69.com/contenus/files/gorefurenidavufemalebeleb.pdf In PDF document text
    • http://apsencollege.org/test/fckeditor/file/gojojuvaz.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/kifabiku.pdfIn PDF document text
    • https://apra.pl/files/file/18326140187.pdfIn PDF document text
    • http://france-ex.com/images/blog/file/tufovuwodazajusolujesexaf.pdfIn PDF document text
    • http://tcyy88.com/userfiles/file/2021092611320573499.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/57425338107.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/xifutonupada.pdfIn PDF document text
    • https://ubitanduk.com/contents/files/pudekiwagebojonujin.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/63991216371.pdfIn PDF document text
    • http://solo-reisen.com/media/images/file/sovemajisalotaba.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/91496660329.pdfIn PDF document text
    • https://purmoradiatoriai.lt/images/files/5914417019.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/32489402116.pdfIn PDF document text
    • http://dgkno.cn/upload/sojoxiporut.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149fa2e83fa6---kokapekov.pdfIn PDF document text
    • http://fundacjahfg.pl/upload/file/15369489041.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614b750e10b3b---72074216275.pdfIn PDF document text
    • http://tzsunup.com/upload/83681807723.pdfIn PDF document text
    • https://matagujrischool.com/admin/imagetemp1/file/42023561317.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/gadenejedila.pdfIn PDF document text
    • http://hotechike.com/files/files/jurebenebaratuke.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/68578204638.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/76709573937.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=download+record+screen+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_off0000aedd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F4 10496 bytes
SHA-256: 28275f757d9d6d823e5e64162ed89841ab9a962762af4a866a3ddcc7d9fa5b67
font_02_sfnt_off0000defb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFB 15764 bytes
SHA-256: ac3b31b2f347206644b154add705029cbee10caa00fd62fdfd68268f36fd5f23

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