Malicious PDF — malware analysis report

Static analysis result for SHA-256 fde7433ecae0096f…

MALICIOUS

PDF

83.5 KB Created: 2021-09-22 20:30:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 581ae2393a520d5144d3f5b32ae3021f SHA-1: a530c8fd9e0e449030a31e643ac6d6c98c002b7c SHA-256: fde7433ecae0096f3f93f6ecc9cdc473621ead5b3ea6be5cea332dc1cabbfc1d
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with several heuristics indicating a link farm on disposable hosting and algorithmically generated URLs. ClamAV detection and ML classification strongly suggest malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://inwebjor.ru/uplcv?utm_term=filmywap+2019+bollywood+movie+download PDF link annotation
    • https://grdr.org/paidel/ckfinder/userfiles/files/dekemolukula.pdfIn PDF document text
    • http://isystem.hu/userfiles/file/safevigi.pdfIn PDF document text
    • http://ambulatorioveterinariosanfrancesco.com/userfiles/files/73809707899.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/petugezesadasajigivaz.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/60369647194.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f0ab875b7---94385716089.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/6809584254.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/kunozemumutakutewuzato.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/lanivarojum.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/23443304543.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/xelirekudagipetevekatar.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210905_204917.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/8534937326.pdfIn PDF document text
    • http://smelawservice.com/file_media/file_image/file/pikigufunuros.pdfIn PDF document text
    • http://agt.es/files/galeria2/files/tajolor.pdfIn PDF document text
    • http://2rent.gr/userfiles/file/99726404685.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/boxuluzaluf.pdfIn PDF document text
    • http://hstechno.com/userData/ebizro_board/file/gorizaxiburomu.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/fivinudanepogazival.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/44284443728.pdfIn PDF document text
    • http://canadapremiumlubes.com/survey/userfiles/files/demesejutifogegim.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-12/20210912124334594042.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/retitoxebawemokuzoxo.pdfIn PDF document text
    • http://starfishdowney.com/uploads/files/jixusisezegijo.pdfIn PDF document text
    • 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_off0000e0f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F9 17808 bytes
SHA-256: 2b3b04cef7f856ff3e15aa1d32596bc17228d00892008fdf79cef6b4b741841e
font_01_sfnt_off00010f0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0F 11032 bytes
SHA-256: 151adcb1d5fdeb290a6476b946cf77d8fe1f6c0e7da67d3159dff28852c1f494
font_02_sfnt_off0001287e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1287E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1