Malicious PDF — malware analysis report

Static analysis result for SHA-256 662c2a4bd9886f5b…

MALICIOUS

PDF

87.7 KB Created: 2021-09-11 18:34:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 95f87bfc3d1e742faf7d039f7820a4ba SHA-1: a881e9cc94714d65c1a1918ed7647fa8c65f6471 SHA-256: 662c2a4bd9886f5b000d70d4c66a8b157abab65d4f87caf8cec109a60fcebb7a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. While no scripts were extracted, the presence of many URLs suggests an attempt to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://live-lessons.net/lcj/web/uploads/assets/file/nejumujimilonejatubumu.pdf In PDF document text
    • https://eko-briketes.lv/userfiles/files/51644741842.pdfIn PDF document text
    • http://izr.fr/files/10853371476.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/a6f5431c4c6cbbf6c0f9cb25a1f13a49/19946273004.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa2200799d---kuriderovosuf.pdfIn PDF document text
    • http://yourhandmadeitems.com/userfiles/file/23207909673.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/74341757824.pdfIn PDF document text
    • http://chinalabware.es/d/files/volaresesali.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/48302308906.pdfIn PDF document text
    • https://nordavril.com/userfiles/file/24042890126.pdfIn PDF document text
    • https://happyjourney.webtrails.in/ckfinder/userfiles/files/fuminidapida.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/wujejefoba.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/kuvulopazomukud.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/9650746019.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/54922341007.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/75748644530.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/7995474448.pdfIn PDF document text
    • http://rayer.cn/d/files/8751668789.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/bopokopikigarukijatukasin.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/muruwuwomanegane.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/nofuwanuderamodi.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/rosagabatadajexokemage.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/polonoxanat.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/25267963854.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/dukadupuxefalijumiranoko.pdfIn PDF document text
    • https://oxfordjsr.com/userfiles/file/rugomomoxavadapadude.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=the+proposal+full+movie+watch+online+free+with+english+subtitlesPDF 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_off0000e52d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52D 11284 bytes
SHA-256: e05e49615a4d7b71665b87c295d3f2a4a0aa90477adf50709920f8f6c3e97f20
font_01_sfnt_off0000ff67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11779 21664 bytes
SHA-256: c7193f1674bf88975968fdf5c5fc322285e27c487d844740f184b96722b2587e