Malicious PDF — malware analysis report

Static analysis result for SHA-256 91b7a3aa7054f5d4…

MALICIOUS

PDF

83.5 KB Created: 2021-09-18 01:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 53f815a93f30b0bbe01cfdc517c666f1 SHA-1: b81033a191c4f929fd26daa9a9277c4bf5ab9c85 SHA-256: 91b7a3aa7054f5d4d5f53c87f62e05451712bc5a72d0adfc387e6034539ab431
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF document that contains embedded JavaScript, flagged by heuristics as malicious. The JavaScript likely initiates a redirect to a series of URLs, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the numerous unknown URLs extracted. This behavior is consistent with phishing or malware distribution campaigns, where users are lured 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
  • 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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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 https://palet-school.com/files/files/55814431435.pdf In PDF document text
    • http://cottoneauto.it/userfiles/files/56823882081.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/gijenep.pdfIn PDF document text
    • http://sswjeans.com/files/56235581316.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/16202969213.pdfIn PDF document text
    • https://teamcode.net/upload/files/nebirusafozojivafi.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/kezugufep.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/97449772178.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/dilitafamaveb.pdfIn PDF document text
    • http://ph-easycome.com/userfiles/file/taramakogeduvu.pdfIn PDF document text
    • http://ore-processing.ru/d/files/62542757009.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/3986734243.pdfIn PDF document text
    • https://kotata-zlin.cz/obr/clanky/file/terof.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/58989664795.pdfIn PDF document text
    • http://aprt1day.ru/file/12440779607.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/zudamujaruwuguxolisifu.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/77846439595.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/nirabobu.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bacd835b73---begeperisa.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/11326854516.pdfIn PDF document text
    • http://mcserpenti.com/userfiles/file/xisoxodofez.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/fakewavafinez.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16142e3b672d7b---37015658892.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/30696744514.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=live+walls+for+androidPDF 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_off0000e20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA26 10356 bytes
SHA-256: 7c51bc630d32354d76bbbcd550888a0b737a71ae40082655f42ecfb1c9164f6b
font_02_sfnt_off000111a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A8 18252 bytes
SHA-256: 9ab94573af357b1cb7317a416c0f2922dc2967bb1530c389504bd8ff75e6a427

Open this report in the interactive analyzer, or submit your own file for analysis.