Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e1ff35e658d8193…

MALICIOUS

PDF

84.0 KB Created: 2021-09-18 19:15:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b2885c81b1c0e85b868160b3c9d6b13e SHA-1: ae39594ac017ec6a3911b98c4458bddb765d4380 SHA-256: 1e1ff35e658d8193f4004f87ea1d24c0f96032bca8f109adae33cceacaa0f691
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://stylekd.ru/files/milujavureregupe.pdf In PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/4364e9909b72d8cdd7581a32f7befbd7/jabafatexogovopagalowojoj.pdfIn PDF document text
    • https://shreenatharcade.com/userfiles/file/16374819774.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/mizefawilavivunazi.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/gidogozekorogebeliwafu.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/30377695427.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-12/20210912070057719831.pdfIn PDF document text
    • http://belean.pl/userfiles/file/47994721791.pdfIn PDF document text
    • http://innotack.com/userfiles/files/98319156654.pdfIn PDF document text
    • https://xn--psg-9lac.hu/files/files/jarakasuz.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/84218941711.pdfIn PDF document text
    • https://hunglivet.com/uploads/files/202109091534053228.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/retaliwovu.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/47512694429.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/todibolivabo.pdfIn PDF document text
    • https://ww150006.linebot.net/upfile/files/20210911114516.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/31707943066.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/bavabozulunamezapo.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/28563737428.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/7e7d9e3d2f9d4b536593cabfacf68fa4/80129092660.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/16718890296.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/74753824848.pdfIn PDF document text
    • http://skalamatbaa.com/userfiles/file/68316494143.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/kemazasolejekojobujufuvel.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/porulimobu.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/bigawemegopupaxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=poblacion+muntinlupa+zip+codePDF 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_off0000e33c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33C 17728 bytes
SHA-256: f8afc373f86ce6b2580fc0593c682684835c922e319466499a26ca898bc256a3
font_01_sfnt_off0001118b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1118B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A2 10708 bytes
SHA-256: f0fd32eeaa6f0b13cf4d2545ab3bc459f288c7afa5c6d3ab36b3a4441e0d73eb