Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ad414033066d351…

MALICIOUS

PDF

88.0 KB Created: 2021-09-13 16:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e30b85fc50c328e2d2fe355d9c91f074 SHA-1: 78e251a100c80334cea36198b58226ace262c97c SHA-256: 6ad414033066d351326f5acb708b41c3917f84eef3d414f623b4420d8c5b874f
126 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs that point to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the true destination through a large number of redirects and potentially malicious links.

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 https://queure.ru/uplcv?utm_term=stars+without+number+revised+pdf PDF link annotation
    • http://hud101.vn/webroot/img/posts/files/54985591532.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/47234921614.pdfIn PDF document text
    • http://pk.mo/userfiles/file/75328921007.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/64439771773.pdfIn PDF document text
    • http://sdes.in/uploads/mesoxejoxulepewonixaxi.pdfIn PDF document text
    • https://datenglagi.com/contents/files/88037281337.pdfIn PDF document text
    • http://budapesticukraszdak.hu/userfiles/files/movugoxuverodajibak.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/parimadule.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/28911837154.pdfIn PDF document text
    • https://mimpisiluman.com/contents/files/rasalipixaxujidonuxen.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/91569899064.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/tofixasudodegijana.pdfIn PDF document text
    • https://immobiliareincentro.it/allegati/file/15684241189.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/28869736143.pdfIn PDF document text
    • http://0975811252cool.linker.tw/files/rofuwulazugimejowe.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613dec919a04e---58685599247.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/26628693754.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/kipolikaxatiju.pdfIn PDF document text
    • http://easyhypermarket.com/userfiles/file/15367783083.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/56560055455.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles/file/7295864176.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/besonukuzifukeluja.pdfIn PDF document text
    • https://mimpishiodua.com/contents/files/vujijefonowanotaza.pdfIn PDF document text
    • https://manhalhealing.com/userfiles/file/91329416859.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/bc9595bb06935f8f32739fc19d93e1a8/dezivi.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/89585989679.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_off0000efd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD6 11184 bytes
SHA-256: f8627beead22201bce07efeb476843bd2e127873cfbd2b1258a4f37f248e3d7a
font_01_sfnt_off0001099f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B1 18420 bytes
SHA-256: be9492571db2909aa77dc2bad12e914f78fc2c9696e1ae458443cb1d5dd0b705