Malicious PDF — malware analysis report

Static analysis result for SHA-256 a337632cd377311f…

MALICIOUS

PDF

74.2 KB Created: 2021-09-14 02:21:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ddbd8c1be3981524a5f2ba58a2891e64 SHA-1: ffd9dc6ea6a5e38b1f6f1d4c2b8c7092082fb829 SHA-256: a337632cd377311f85e82866e48a5d73a5074ae45507ca4530629e0151ba0558
126 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, with heuristics identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the overall structure and URL patterns point towards a common malicious PDF attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://mimpiindah168.com/contents/files/25371135776.pdf In PDF document text
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/sesunazolejemotax.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/20986008230.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/rifiwedimesibujone.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/renosirafobonevinesuxevew.pdfIn PDF document text
    • http://chinhlytailieuluutru.com/media/ftp/file/zarerologut.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/werosorukipukelit.pdfIn PDF document text
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/vuvanudag.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/xemukesazabarup.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/doxesavusiji.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/dopifusogilade.pdfIn PDF document text
    • https://bike-accessories.supersites.gr/content/ckfinder/files/kolizikunovebawiruruwi.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/2477979017.pdfIn PDF document text
    • https://cet.sk/res/file/64885142161.pdfIn PDF document text
    • https://angkagenap.com/contents/files/64663656439.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130f1299a711---76599133184.pdfIn PDF document text
    • https://mbbs.hr/files/12528918268.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/29423096366.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2d3d15db3---12979515566.pdfIn PDF document text
    • http://hacsbathtarntaran.org/~/userfiles/file/puvabamija.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/zomunivulojimetotezefomil.pdfIn PDF document text
    • http://drironcat.com/images/file/momuzejidiseramasadafode.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/57129928569.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/ramadetusulukubikekujik.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/walexowozojer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=art+of+war+legions+unlimited+moneyPDF 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_off0000c2d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2D0 15360 bytes
SHA-256: d5a24e5ee2ff7881662c2cdfbfea3e1cc2f9fc90298ea9f335a14e6de8460b07
font_01_sfnt_off0000e99e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B5 10976 bytes
SHA-256: cebcad1eaafd2a7bab7b79bfef0f4bd4c59c3ed8f63a82db6502d87b22b8163f