Malicious PDF — malware analysis report

Static analysis result for SHA-256 55237e67271a4765…

MALICIOUS

PDF

80.4 KB Created: 2021-09-18 10:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4a73fb9500c030904a6fa604910d3fd2 SHA-1: 440f83b0eb4c76b7788332bb4211f5870b4c14a0 SHA-256: 55237e67271a476581dd4b4c1bde9a304797e09bf7b12838877b7250f61c6545
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm designed to distribute malicious content or phish for credentials. While no scripts were explicitly extracted, the PDF structure and numerous external links indicate a high likelihood of redirecting users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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.
  • 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://pillshop.ru/uimg/files/juvowizojozaz.pdf In PDF document text
    • https://indiansabroad.uk/userfiles/file/tuvagafetuvirobuwad.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/wotajifof.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/vumovifisabuxinenu.pdfIn PDF document text
    • http://airzo.net/userData/board/file/vubofozezibo.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/96218906401.pdfIn PDF document text
    • http://clerus.hu/files/file/21433912282.pdfIn PDF document text
    • http://eapver.com/upload/ckimg/files/202109160253046596.pdfIn PDF document text
    • http://belly.bpv.su/content/files/files/56215402357.pdfIn PDF document text
    • http://zhhyhb.com/uploadfiles/files/daperodowu.pdfIn PDF document text
    • http://finara-v.com/file_media/file_image/file/bokelebipuj.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/21455331241.pdfIn PDF document text
    • http://canyonmeadows.org/userimages/5525274877.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/nuvavalisub.pdfIn PDF document text
    • https://eniedu.com/data/file/20210907175215.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161383e12ef600---17859741858.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/28147746688.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16140e4e1218df---duxusokovor.pdfIn PDF document text
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/gogasikakutebini.pdfIn PDF document text
    • https://sokole-tps.pl/userfiles/file/90800954057.pdfIn PDF document text
    • http://clingac.com/d/files/rezezanupapo.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/81123766576.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/80536771000.pdfIn PDF document text
    • http://oris-am.com/editor_up/13852770238.pdfIn PDF document text
    • http://horvathortho.hu/tmp/99885613364.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=garena+free+fire+pc+download+apkPDF 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_off0000ce55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE55 10564 bytes
SHA-256: 11bc4c0de513d37f1796d3d695b993cc5f5ad691f59c0f7d143eb465978f830a
font_01_sfnt_off0000e689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE689 20204 bytes
SHA-256: a5b7975081af69421756e51f6fc9ea71598677a5b0fa15205f128e3e2550db84
font_02_sfnt_off00011ba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1