Malicious PDF — malware analysis report

Static analysis result for SHA-256 65887e0888a3e251…

MALICIOUS

PDF

82.7 KB Created: 2021-09-17 00:33:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d1c6d7aec61350deac9ed640c857c0fb SHA-1: b929e22feb1c3ed9d2e7e9ca5cc9dc44a26bfd80 SHA-256: 65887e0888a3e2514f4349365ff4a0084f5182c6fc5a61375566778d19f6443a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is structured as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. The presence of embedded URLs and the heuristic 'SE_DOWNLOAD_BUTTON' further support the attack pattern of tricking users into clicking malicious links, likely to download a second-stage payload.

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://queure.ru/uplcv?utm_term=navigateur+android+avec+flash+player PDF link annotation
    • https://ispartaorganizasyon.com/ckfinder/upload/files/juveliwuretoze.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/jaboridivo.pdfIn PDF document text
    • http://henskeschildersbedrijf.nl/upload/32339462741.pdfIn PDF document text
    • http://gr-chem.com/upload/files/duwexofesonuluviwetu.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/goxepixezen.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/49137936469.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/veragesijonepurifop.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613e890fe755a---busiguzorasuber.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/67815156654.pdfIn PDF document text
    • https://actorconseil.com/files/file/8505092416.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-7/20210907062649404720.pdfIn PDF document text
    • http://tehla.eu/userfiles/file/baxagedegisofalose.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/58620286835.pdfIn PDF document text
    • https://kaparatt.com/images/File/75490099018.pdfIn PDF document text
    • http://le383.com/uploads/files/64457318041.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/favibelel.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/86534813646.pdfIn PDF document text
    • https://gfwofficial.com/ck_imgs/files/gevujabudofamomi.pdfIn PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/90622326192.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161398cf692655---35003230999.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/71659318648.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/86776702794.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/61222068128.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/36444443840.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_off0000da65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA65 11156 bytes
SHA-256: 44691924015fcd83885d26f26228ba3b872dcec546737d78c1e6afe6f62ac4c4
font_01_sfnt_off0000f443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF443 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C55 18128 bytes
SHA-256: 25d9d15e80725a074fc6f48a0538136cab108e54e3812562f63b202ca16234b0