Malicious PDF — malware analysis report

Static analysis result for SHA-256 893dcea554f83787…

MALICIOUS

PDF

82.0 KB Created: 2021-09-11 23:02:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bc5a70bf52ba14feba6475fd29262ccd SHA-1: fb118be289e96fc01f716665fe6ced00ea9e7415 SHA-256: 893dcea554f83787c55d9f9ff07c35639ec5bebc984e3d759888040a045d09e6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to PDF files on potentially disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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.
  • 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://analogsys.com/uploaded/file/18251887736132f22ac8337.pdf In PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210909_50146A333B29D024.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210908_6921708743A86DF4.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/papuvaguxajusefiwi.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/pizukibabapu.pdfIn PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/80274022434.pdfIn PDF document text
    • https://laps.pl/userfiles/file/wawagoda.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/44425915013.pdfIn PDF document text
    • http://hawaiianhunareiki.it/file/vumapobelu.pdfIn PDF document text
    • http://gimhaejazz.com/fckeditor/userfiles/image/13917236261.pdfIn PDF document text
    • http://iproperty.ae/userfiles/file/furejevenewowe.pdfIn PDF document text
    • http://nenorm.com/files/files/gaxavovijodasunapar.pdfIn PDF document text
    • https://riwg.in/userfiles/file/5061684155.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/23149239162.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/72257743665.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/wanumunefewezorebezes.pdfIn PDF document text
    • https://ruedi-leuthold.com/userfiles/files/69017860171.pdfIn PDF document text
    • http://www.catedralirodahaz.hu/data/editorfile/20553585001.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/bidazurerob.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/52802467008.pdfIn PDF document text
    • http://www.plan.msu.ac.th/ckfinder/userfiles/files/21171726483.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/161357888e0869---90306487976.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/13562545223.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/20380046824.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/rilukuji.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/fevafod.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/89293556626.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=read+dark+lover+online+freePDF 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_off0000dda3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA3 10284 bytes
SHA-256: 57b2f47f6e4a976e8e36529bb4fb6bbb60d0301441d5d172d8f194043197cd4e
font_01_sfnt_off0000f4d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE8 17508 bytes
SHA-256: f09412b537a15f1012d369db89275d26db428d6258686a6bc38792b0f835f81e