Malicious PDF — malware analysis report

Static analysis result for SHA-256 c76f30a96bcd71ba…

MALICIOUS

PDF

80.5 KB Created: 2021-09-16 03:52:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 37061a07396f50c45132515843b55ac3 SHA-1: 4808cd9674cbba3e818d563abec545caa07c94cb SHA-256: c76f30a96bcd71baa0505ab7b6ae0d1b93df4f75c64da22062d21a3af1b6dca4
126 Risk Score

Malware Insights

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

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, including one identified as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://mosaicopeoplecorporation.com/ckfinder/userfiles/files/27536984848.pdf In PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613515b154185---wufabobukivanexifi.pdfIn PDF document text
    • http://live-net.it/file/33556542230.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/bavapuzezowa.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/82576096100.pdfIn PDF document text
    • http://cecev.com/stockages/files/wimowawap.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/finonerebi.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/vadejasumu.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/dewipurutepam.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/92284189128.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/17247360407.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/lukeketugoxur.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/79102749743.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/73839188631.pdfIn PDF document text
    • https://vcubusinesssolutions.com/userfiles/file/88445944260.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210914011107.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/lnkkk07b5vreti3lnmnop2u7vp/bekimugutinopige.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/solinefasebubenewugido.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/22298021005.pdfIn PDF document text
    • http://oa30us.com/userfiles/file/bufelulirepa.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/95860735029.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=apk+editor+pro+paidPDF 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_off0000d96e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96E 17228 bytes
SHA-256: 48e726fa445e2ab6469ff8e6d97c86e153e1d96740185a732a15fd4be5dad570
font_01_sfnt_off000105fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FD 10140 bytes
SHA-256: e46783565853bf5b82017f119a60cd45df68467f34650dde82ae911ddf07b00a
font_02_sfnt_off00011ccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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