Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d6d36b7c9389474…

MALICIOUS

PDF

82.0 KB Created: 2021-09-16 15:46:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a7c704f7311f40fb62cb69f5f5244b09 SHA-1: bee7815401f4590fef4b646273353cae72a9981f SHA-256: 1d6d36b7c93894741ce39b9e366c691394ce3618b5bae2d1c4022479dcfdc385
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, and a heuristic identified it as a link farm. This suggests the PDF's primary purpose is to redirect users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://eltprof.ru/userfiles/file/misogasadozitakegi.pdf In PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/tigexupowamukenolazetatun.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/lixosonipajog.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/mosepikeb.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/97671927152.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/bezim.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/bavakawo.pdfIn PDF document text
    • http://guide-eq.com/userfiles/file/20210913085814_ianuvs.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613757c326609---13311177241.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/lonom.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/60d765a975caf8888220edb6d071db3f/78976580117.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/19783350036.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/48165792005.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/40115267066.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/zaxados.pdfIn PDF document text
    • http://nemochem.cn/upload/files/64732234011.pdfIn PDF document text
    • http://prepearl.com/uploadsfile/6018948977.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/lalewotaleteperakunuki.pdfIn PDF document text
    • http://bmfjhjk.friend-match.com/upload/files/refefumipajipabonogabufu.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/11100987526.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/rowimezudof.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/vamowil.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/92541394121.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=download+mod+sims+mobilePDF 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_off0000db8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8E 18080 bytes
SHA-256: 6d89414717047673362c87d9f1a32d0863ce622acf9cc095ee907670e9d4d34e
font_01_sfnt_off00010a8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A3 10440 bytes
SHA-256: abe02d7031402f323618e899be52f04d50b87ad41b46b71e6ba43e140326b582