Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e73005fcc883eda…

MALICIOUS

PDF

71.1 KB Created: 2021-09-14 05:03:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dd5c800e0ca875ffd78f53a8d69281e7 SHA-1: 24ace70b71f5a24a65e09a0e6b7c7dd43396936b SHA-256: 4e73005fcc883eda71f76b90a26e348b3ce5a24a84f1c0037b6498b4ab502197
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document contains a link farm and uses urgency lures, suggesting it's designed to trick users into clicking malicious links. While no scripts were explicitly extracted, the PDF structure and heuristic findings strongly suggest an attempt to deliver a secondary payload or redirect to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://citygclub.com/ckupload/files/48664227523.pdf In PDF document text
    • https://topinsolventa.ro/userfiles/file/12779218572.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210903_225041.pdfIn PDF document text
    • http://xfswchem.com/upload/files/gawonuseroxaxipote.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/98611513133.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/nulorudibiduxit.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/xametupixavitadafutudoxir.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/28375944819.pdfIn PDF document text
    • https://eniedu.com/data/file/20210914101205.pdfIn PDF document text
    • http://xn--80aa5alfu.kz/file/26552854812.pdfIn PDF document text
    • http://vindindex.nl/images/uploads/44636172723.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/worowidijanovunure.pdfIn PDF document text
    • https://kingcom.edesign.fr/gr33/web/uploads/assets/file/komapovuviwajok.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/83610572726.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/bumaxodegavorima.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/fapus.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/b7e98a5f0617be422288ee08c0f3059a/xexotizegusonuvabutiwusov.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/24870067702.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/kuvosa.pdfIn PDF document text
    • https://giaynangchieucao.com/userfiles/file/nujewobunuzewofofusuli.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/mizapepileradivofaxamipi.pdfIn PDF document text
    • http://crmrealty360degree.in/ci/userfiles/files/kosepewuvoxulunufewes.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/zanaxuno.pdfIn PDF document text
    • http://sakulchaiplace.com/Uploads/file/97349780678.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=clean+my+phone+pleasePDF 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_off0000b61e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB61E 10372 bytes
SHA-256: 308343589bafdf35181c5b73ab8f0226f53577488ffb408df1def6b0241e7838
font_01_sfnt_off0000cd63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE575 16228 bytes
SHA-256: 4151b0ede8e36de14d5e95c4e7e898938e14d49e61eec53fb675e8500a0b0841