Malicious PDF — malware analysis report

Static analysis result for SHA-256 55009cd9114ad8af…

MALICIOUS

PDF

83.2 KB Created: 2021-09-14 10:30:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 48e82f39deec9b100e8c193461ffc5bd SHA-1: 53cbea7afbef5c0c56128c61f12146686340d8af SHA-256: 55009cd9114ad8afb7bc4c741bfd8282d9d370323d2eee8d9c03de0d721064bf
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external resources, many of which are algorithmically generated and hosted on disposable domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to download further malware or engage in phishing. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://pomodorolennep.de/gfx/userfiles/files/99584573397.pdf In PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345afbc0359---6747953203.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/beguxowotigovafopekanojox.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/mezirikutimu.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/tokuzadexaga.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/jofozenerujepibizifi.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/lubenalumosemogefasotunoz.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/11101274942.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/vonatusobixifimuxagegede.pdfIn PDF document text
    • https://qwert5.com/psum/admin/userfiles/file/ragidopopovubexime.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/sitaliwikusitawobulumo.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/vezojivanalemolor.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210905095841.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/fopegikixas.pdfIn PDF document text
    • http://gfk-schwimmbad.de/i/File/98991741830.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/9llm0r208ielto4acgr5vmeifs/luxixa.pdfIn PDF document text
    • http://besteva.com/upload/files/58902876208.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/pafowatet.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/faguwapudepitopuvi.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/vewiw.pdfIn PDF document text
    • http://koutingchina.com/upload/files/nofobevakemokilapotixasa.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/9821213488.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/89288170785.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/67343591012.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/68140484368.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=download+grand+theft+auto+3+apkPDF 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_off0000df43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF43 18052 bytes
SHA-256: 2f3f1e62e0674fb06869b0602e001b7980c9c082ea5bdb03a4918455b95a225e
font_01_sfnt_off00010dd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD3 10968 bytes
SHA-256: 7bbeb5833b887ec0500c7eea8e88ff0752de08fbb98eeccb1c4a00e637c687e1
font_02_sfnt_off00012723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12723 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1