Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e65b01d9342da2f…

MALICIOUS

PDF

84.5 KB Created: 2021-09-16 23:07:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6f53bce23cab3599edc6279251b2f872 SHA-1: 1c79962ccaa1dcef1ffc60122fd10c3c12052fc9 SHA-256: 9e65b01d9342da2fcf757d08cd0d01903b2445d3b358a4e42adff077a47d22ef
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with many pointing to disposable domains and exhibiting link farm characteristics, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://anm-av.de/uploads/files/45333110593.pdf In PDF document text
    • https://cuatudongsaigon.net/uploads/files/43974412541.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/mobusimi.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/27402688440.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/52987456602.pdfIn PDF document text
    • http://195exim.com/datas/files/27819397339.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/lulufadizupevinuruj.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/moxuzal.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/67965826806.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/nodenipasezosipalokelewe.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/kitirebalotubix.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/kilovon.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/44455368132.pdfIn PDF document text
    • http://art-ball.net/files/file/zajafisivoviwa.pdfIn PDF document text
    • http://industrialdevices.in/uploads/98980100075.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/83680669580.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/77935778431.pdfIn PDF document text
    • http://gro-felix.si/uploads/gidexesomu.pdfIn PDF document text
    • http://gysanya.com/upload/file/2109091916281666926i16pvukn41m.pdfIn PDF document text
    • http://phanvienphianam.com/uploads/userfiles/file/xafixivemagedumoziviwif.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/bemazoxadepavolo.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109151628052981.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/gejisazuloveluvuneli.pdfIn PDF document text
    • http://stylekd.ru/files/bitogosipipazidov.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jezedolotiwekunekulinade.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/juletizogelazinitatake.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/mezajivilixonew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=redmi+note+9s+official+price+in+bangladesh+2020PDF 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_off0000df88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF88 18872 bytes
SHA-256: 43ac8d920a040973fa363551b83494c87d1269d83f397c73506784d6c7c13930
font_01_sfnt_off0001109e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B5 11660 bytes
SHA-256: 7bdf7497ecf18ff2b6b5729a64224cc5d378a58010a948e8142d8675a491eea3