Malicious PDF — malware analysis report

Static analysis result for SHA-256 419e52458e2cbd72…

MALICIOUS

PDF

74.1 KB Created: 2021-09-12 00:36:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: e48bb7899af2f618e3f6f2ad3885b89a SHA-1: 629bde16a46d72c3dcbb7c00fba15a5afeb28b51 SHA-256: 419e52458e2cbd7269c59a8e790d9b409bde1fcae05007fd0adc7059219f7d4d
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 numerous embedded URLs, many pointing to disposable domains and acting as a link farm, which is a common tactic for phishing or distributing further malware. The presence of external URIs and the overall structure suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://drafthe.ru/uplcv?utm_term=why+is+my+phone+sending+the+same+text+multiple+times PDF link annotation
    • http://ssaisarang.com/ckfinder/userfiles/files/64500482503.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/duzolamaraseworimobobiwuf.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vuvelebi.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/fofavojuledinud.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/64912860876.pdfIn PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1630892046_33308c6a76.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/13215680070.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/dc98a4c4e1d51154ddd0d11048d7eff9/zulobobebogitekewa.pdfIn PDF document text
    • https://ginniglobal.com/uploads/file/rogutiv.pdfIn PDF document text
    • http://hujiangsy.com/upload/files/48473601254.pdfIn PDF document text
    • http://anindecor.pl/files/file/fimaxutawamaretukojojowu.pdfIn PDF document text
    • https://mpksieradz.pl/upload/file/kilibar.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/1550798757.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/50321900153.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109071816021248.pdfIn PDF document text
    • http://thepnguyentran.com/media/ftp/file/xesokavuxobifoziziw.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/luvanodo.pdfIn PDF document text
    • http://theofficeplus.com/userfiles/file/4130244193.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/29691148462.pdfIn PDF document text
    • http://8njl.com/userfiles/files/49817763287.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/xuruga.pdfIn PDF document text
    • http://coytex.net/ckfinder/userfiles/files/nilebokudijotir.pdfIn PDF document text
    • https://serihosting.com/calisma2/files/uploads/rabozuvod.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613759bcc4615---74618584577.pdfIn PDF document text
    • 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_off0000bb47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB47 11048 bytes
SHA-256: 4f58b19c52d86a6bdc79ef07802a1cc888d5a5dcd0978d18e6e87ef9cf70b256
font_01_sfnt_off0000d4a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A1 17336 bytes
SHA-256: b298415a31b7650968d0992ead6893304d25c6371b757f4bccbe8707e0e82a4f
font_02_sfnt_off00010204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10204 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1