Malicious PDF — malware analysis report

Static analysis result for SHA-256 7089e640bfa1426a…

MALICIOUS

PDF

75.2 KB Created: 2021-09-12 10:11:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d49d3f165b55d94ac0009f86019507f7 SHA-1: ab21474c8f865761f43338034e85c56d66489028 SHA-256: 7089e640bfa1426a670cb4e365d224d2ecd4787f1a71d16495d9fe2ae66b707a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for phishing or distributing further malware. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://webinaris.blog/ckfinder/userfiles/publics/files/foliw.pdf In PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/95296442087.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/36377053905.pdfIn PDF document text
    • http://yjccnc.com/upload/files/vodapixapojuv.pdfIn PDF document text
    • http://tornyanggrace.com/upload/file/29550775430.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/66918691012.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/42703588683.pdfIn PDF document text
    • https://pnlcoach.com/misc2/file/In PDF document text
    • http://jjinline.org/file_upload/file/katoliganobabosizib.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/regedakafanavozizureruz.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/posikalugefab.pdfIn PDF document text
    • http://venkateshservices.com/uploads/papiguvepumoz.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021091204531759.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/renaludevogumopo.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363cd6b5146---pomabaguwajawid.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/bilugokogogitovus.pdfIn PDF document text
    • https://toocapen.com/files/99656247135.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/66326377682.pdfIn PDF document text
    • http://somersetcountybar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bupejojoxowurad.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/97952320118.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161377b5624311---14834022842.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/09/12/file/20210912_145328_179.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/dabunepi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=arihant+idioms+and+phrases+book+pdf+free+downloadPDF 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_off0000be07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d61e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61E 11064 bytes
SHA-256: b751e6a11f36bf2851e85e36b2d10836df2fe00e3d08872af9a0c4462d563600
font_02_sfnt_off0000ef83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF83 18264 bytes
SHA-256: 07df118e5f4b80af9e82c4e35da512df0f0110288c242ce0c4061ec1c96899e5