Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f4c9fe61f00e65b…

MALICIOUS

PDF

79.2 KB Created: 2021-09-12 22:45:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d514b6c63fa4cabf7a13955667a5d965 SHA-1: 238ef444457a9eed2dcc30d929d264f2563f235b SHA-256: 9f4c9fe61f00e65bae9bc842e398a88909f86ca21cb66f6b7c6b8c4378e7d25a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous unknown URLs suggest a phishing or scam attempt to drive traffic to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://tarsiman.ee/files/file/52776806736.pdf In PDF document text
    • http://to-kajihan.net/js/upload/files/59707697105.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/89824826485.pdfIn PDF document text
    • https://expomediainc.com/upload/file/bisuro.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/kufegolo.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/dh2oved3ugnsaafvbc9843e6o7/33061602703.pdfIn PDF document text
    • http://poledance-chrudim.cz/files/file/nopuxuxidejekirubuvi.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/13158475738.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/23779488470.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/fibegiredot.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/56557742063.pdfIn PDF document text
    • http://wirheiraten.de/images/file/salojajusa.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/10628364333.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/nisedo.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210913031423.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210911225547_583433975.pdfIn PDF document text
    • http://chieucoingason.vn/files/dujabujubozumuvojasasiko.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/83309351098.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/weginemakojofepi.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/pipuxifoduvepox.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/womegomi.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/47387832114.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+transfer+game+data+to+new+phone+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_off0000d030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD030 10976 bytes
SHA-256: a42acacb602b6ed4b0bdf1c57bfc72760f83c40bbc877d65a3560b323bd0085f
font_01_sfnt_off0000e94c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001015e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015E 17488 bytes
SHA-256: 93a2ddc351766d66bb3313265c8a1a0d4f31ed4bc48fda4abf6d01f16ae4227f

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