Malicious PDF — malware analysis report

Static analysis result for SHA-256 29ea7a1c0c72f2ef…

MALICIOUS

PDF

75.4 KB Created: 2021-09-14 07:53:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 04a5fba31354501a8d14eb468412d7c8 SHA-1: 428c6c0987533299375714672d21842335e1f42c SHA-256: 29ea7a1c0c72f2ef3ef9182be3537aa56b26ab6179110b6d7d66e89bb7e885ae
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous external URIs, indicating a link farm designed to redirect users. The ML classifier also strongly indicated maliciousness. The presence of external links suggests an attempt to lure users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://synerhu.ru/uplcv?utm_term=ghd+sports+android+app PDF link annotation
    • http://fotocaroli.it/userfiles/files/96680989484.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/bakedilaneji.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/pafuzokavitajinonefikopek.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/supizotef.pdfIn PDF document text
    • https://etevent.itweald.com/uploads/files/613db7a5570ac.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/91348919705.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/kisekudexupiwafiwimon.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/remigugidaromeduw.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/88877320030.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/xuturanego.pdfIn PDF document text
    • http://millecolori.it/images/file/wemaz.pdfIn PDF document text
    • https://energooptima.hu/upload/File/14624638641.pdfIn PDF document text
    • http://bio86.fr/userfiles/fichiers/vipupifunugud.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/6225111376.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/bijamaxuz.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/hpkk4baroror3rgnd0mbeej0ga/29154974245.pdfIn PDF document text
    • http://synphabase.ch/upload/file/37805680882.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/g19t9fsbd8bgvi60otmamhdl4k/dakuxiw.pdfIn PDF document text
    • https://resicolor.com/upload/files/kovabanoxoxid.pdfIn PDF document text
    • https://esz.jp/img/editor/files/zasivivojakafevor.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/rowagubexegifazekof.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/mijupipogakuderowid.pdfIn PDF document text
    • https://skopjemuzikon.pmgrecordings.com/ckfinder/userfiles/files/bekezufisenudokiwuwu.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_off0000c410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC410 17388 bytes
SHA-256: efd3005487fcd11e3d0723dfa9b455f62b69e4a21585a1cb2d23cf2487cd59c2
font_01_sfnt_off0000f112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF112 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10929 10348 bytes
SHA-256: b494d8266d4e71e955c7d240a265a2ffb89664d54f2296eccf6cbf3fcb1ab1b1