Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ad1842d53a54484…

MALICIOUS

PDF

75.1 KB Created: 2021-09-17 19:57:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8390e2653a01210db249ba5351154b75 SHA-1: 19e53f7a555afa528ebc87b1af26e8e6b8f43c95 SHA-256: 0ad1842d53a544848fad4636f75e305440670d049af03c2ffcd361597d093ca3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as a link farm, a common tactic for phishing or distributing further malware. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://crewmak.ru/uplcv?utm_term=remove+mi+browser+miui+12
    • http://travelsi.ru/ckfinder/userfiles/files/woxulajovoferaped.pdf
    • http://sinoscaform.com/upload/ckimg/files/202109120235013899.pdf
    • http://weddingdove.tw/uploads/files/202109060149228737.pdf
    • http://mishor-uvk.com/uploads/files/powetudolur.pdf
    • http://pastoret.it/userfiles/files/sadawowilotip.pdf
    • http://e-park.es/img/uploads/files/86781949129.pdf
    • http://reichspfarrer.sk/file/12776628342.pdf
    • https://indicaperu.com/userfiles/file/pelulisigexogenipoze.pdf
    • http://dtyxbpzx.com/filespath/files/20210909194715.pdf
    • http://nesthomes.in/userfiles/file/61483842856.pdf
    • https://www.zolmedis.lt/ckfinder/userfiles/files/jimuwuke.pdf
    • http://bjsixiang.com/jingkelun/userfiles/files/20210913140720.pdf
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/nafugiguteferikizituneta.pdf
    • https://forumsevens.com/images/file/95267825717.pdf
    • http://cutyoursupport.com/userfiles/file/kuvugi.pdf
    • http://slovoveri.org/userfiles/buwaluvuwobal.pdf
    • https://hunghiephuylog.com/upload/files/84251327942.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139abcc15784---21140285390.pdf
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/60455850825.pdf
    • https://pavillonwohlen.ch/userfiles/files/potosuxevukunipewesuxosot.pdf
    • http://abpjseah.news-read.com/upload/files/62089931280.pdf
    • http://usaoxin.com/userfiles/2021-9/file/bofetinerunap.pdf
    • http://ohdiabo.net/images/ckeditor/files/87167896313.pdf
    • http://myflora888.com/ck_files/files/593489668.pdf
    • https://dammesliepas.lv/ckfinder/userfiles/files/rewuvupijavejozadi.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/f024bac191bbee71ec9a7ce9717137c3/23396345712.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3f4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F4 16792 bytes
font_01_sfnt_off0000dc0b.bin
e1212adb331cdc0ce8cb60e00e2cbbbababc60feea477971b7a3dcfb7a51e81e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0B 10468 bytes
font_02_sfnt_off0000f3f8.bin
cda2f593f74a624273076ee1974670123f4382ece9239503831fba162c61c6be		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F8 16848 bytes

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