Malicious PDF — malware analysis report

Static analysis result for SHA-256 565097ccdefea1cf…

MALICIOUS

PDF

83.8 KB Created: 2021-09-21 08:14:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bf0eec520f02c5fe8dd32361d82d86f9 SHA-1: 38d7137ab9e712cbe29fe0bf0d8a555cf06aa6f1 SHA-256: 565097ccdefea1cfce242a5a2915516bada3131fd1177fdf1422105a23ae11dd
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external links, including one identified as an algorithmically-generated URL. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to exploit vulnerabilities or execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nanoservice.cz/upload/file/49656183001.pdf In PDF document text
    • https://suruburi.net/mm/file/24120322959.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/54406319431.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/38566051226.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/56493760817.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/mufuvazanevetelija.pdfIn PDF document text
    • http://manvilastrust-org.bvirani.com/ckfinder/userfiles/files/80897434241.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/16856991680.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/sofasigogonatisivadumutux.pdfIn PDF document text
    • http://inkjetartandimage.com/Uploads/file/89541094695.pdfIn PDF document text
    • http://banquat.com/userfiles/files/28238621186.pdfIn PDF document text
    • http://wakesup.org/userfiles/file/3748018883.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/25966960664.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/32639225824.pdfIn PDF document text
    • http://yuhuimachinery.com/d/files/74968091888.pdfIn PDF document text
    • http://tajilin.com/upload/files/34203500640.pdfIn PDF document text
    • https://phukienbep.net/media/files/gukovezoviwaxur.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/zidajokox.pdfIn PDF document text
    • http://storemisr.com/uploads/files/xazapodezizowo.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/18200320967.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/zevosuzu.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/mivuvazarofefesisi.pdfIn PDF document text
    • http://poorclarescork.ie/images/dipesowesoperaxuto.pdfIn PDF document text
    • https://dampinggame.com/calisma2/files/uploads/92787590324.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=web+to+iosPDF 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_off0000e063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE063 19704 bytes
SHA-256: 2b9d798d80128fc828e34d1103fa42cb905b268a0f3c253558f81816c22c9d26
font_01_sfnt_off00011401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11401 9820 bytes
SHA-256: 932fd25b1efeccbff3077b5c7cf19f6cdae45411fa732054d96e39eb09a1f0c0
font_02_sfnt_off000129c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1