Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfd447c354634a9a…

MALICIOUS

PDF

73.7 KB Created: 2021-10-04 18:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2f43a4a9d581f4e3a99b26aa9d313783 SHA-1: bbf0852999c4116eef4381fbb2b97c7a622c95dd SHA-256: bfd447c354634a9af1b424e5576a9be18f1ef40b706d962ad404f2c1ce119387
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated maliciousness. The PDF contains numerous embedded URLs, many pointing to disposable domains, characteristic of a link farm. While no scripts were explicitly extracted, the PDF structure and the presence of many external links suggest an attempt to redirect users to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://safetypadlocks.eu/eurostyl/photos/file/voxedutelarodubujivin.pdf In PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/baviduravomawibelojuvi.pdfIn PDF document text
    • http://detskypohar.cz/upload/file/pawav.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20211004_9D8BB240D19B3B34.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/75753367097.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614334c04ef2f---tomimemelozo.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614457005c798---93313325467.pdfIn PDF document text
    • https://maurinet.com/userfiles/file/bivifuwolig.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/55710720636.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/68575926785.pdfIn PDF document text
    • https://atarentacarburdur.com/userfiles/file/9365269877.pdfIn PDF document text
    • http://apismorava.eu/docs/96892570250.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/36291467400.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/dogub.pdfIn PDF document text
    • http://villacappuccina.com/userfiles/files/tameren.pdfIn PDF document text
    • http://cserepakciok.hu/xdata/file/42754888026.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/suwodewujavogafiviror.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/lowidexevujok.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/nixiwexetunoxi.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/jewemologefelodosu.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/zixize.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/9161674630.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210914150037.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/rosepinatum.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/53478959695.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=wpa+wps+tester+latest+versionPDF 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_off0000be58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE58 16772 bytes
SHA-256: abf48c60deedd62eaa8a878a239c8df5d749365dfc1818087e7d28471f7cb7e2
font_01_sfnt_off0000e98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98F 10388 bytes
SHA-256: e5a4b5853fdd8fa124952166f97475b94574c0aba826f8bbcc802460cf054da3
font_02_sfnt_off00010147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10147 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1