Malicious PDF — malware analysis report

Static analysis result for SHA-256 68d987e4673b2828…

MALICIOUS

PDF

81.5 KB Created: 2021-09-14 08:58:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c0573371edac2b23e80018ce8e4af68c SHA-1: e962f0439f18ca27b5b7a2837230d67505fe712e SHA-256: 68d987e4673b2828717d56a89460f803d3567b50330d2a98d8745e66d7e53f8a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which are part of a link farm designed to obscure the ultimate destination. Heuristics indicate a high likelihood of malicious content, with ClamAV specifically flagging it as a phishing trojan. The presence of a 'download button' lure and callback phishing pretext further supports a malicious intent to trick users into downloading or interacting with further malicious content.

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/jutovibefifidexapegixi.pdf In PDF document text
    • https://baxsporthorses.nl/userfiles/file/nudaxubaz.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/98412937763.pdfIn PDF document text
    • http://edallyshop.com/upload/files/debebiki.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/xizitinaxizeniwefi.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/luv5tgvfv3n9hk6lq784vg72r7/32585335204.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/bulilugiruri.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/68591356866.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/8caenfjostjnapnc9h3mjhk50j/32330879308.pdfIn PDF document text
    • http://rintoyo.com/userfiles/file/laposufakomidixofagonat.pdfIn PDF document text
    • http://retailcop.ca/files/wapewikoje.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/rawufosonosagaba.pdfIn PDF document text
    • http://velocimapper.com/webfiles/file/81581233700.pdfIn PDF document text
    • http://3sdent.com/upload/files/firutomamab.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/feluguxawufawazajum.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/18726666042.pdfIn PDF document text
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/sevuzewetabimabugozedekid.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jevujifodafoj.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/41575571946.pdfIn PDF document text
    • http://phuongsen.com/img-chamthi/files/96867865658.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/tudijudisiderutape.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///basejamiwokuxu.pdfIn PDF document text
    • http://elverum-revmatiker.no/images/file/menijixizuxafetesog.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/20417469284.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=gta+5+obb+apk+free+downloadPDF 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_off0000d363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD363 10720 bytes
SHA-256: fb2de82cf1536184c1521d30283c4ab618b226d578d354124508ebf2a67cbd42
font_01_sfnt_off0000ec08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC08 20556 bytes
SHA-256: 6cf0533eaa852453767c466150a0fb9b6934360db26584c7cef4e350b1ddf9b8
font_02_sfnt_off00012039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12039 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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