Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2527a92eef71ac6…

MALICIOUS

PDF

67.9 KB Created: 2021-09-28 03:09:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6651f2f3fdbbb4e1741183e325625423 SHA-1: 00fed4958b5823b8b61246c740cdfe702eb178e0 SHA-256: d2527a92eef71ac61cdd3df1f638d073112d83948f2c2ac01e3058971663777e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable hosting or link farms, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 https://crewmak.ru/uplcv?utm_term=new+telugu+movies+online+websites PDF link annotation
    • https://koratspring.com/upload/file/zapovemimexukezununo.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/23709871840.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/moronokezidejofaf.pdfIn PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/gasekefutorapasufipog.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/8320187590.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/ea2f2a5148efcbfe06a2064a62e6c735/9898998595.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/gudatajusamexatonotomewuf.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/29524889870.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/ferizugevo.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/50363113286.pdfIn PDF document text
    • http://yingtailong.com/upload/file/2109280600125238562t6ngdavduh9.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/7248829304.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/40ce3261f552cd9f3eda9b00a7bbc896/2552259185.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/36311942512.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/kupigomuxi.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/pelezexixu.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/22417951190.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/tobosetujuwebunutudo.pdfIn PDF document text
    • https://mi-stores.com/basketballtotaal/images/editor/file/41084440936.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/towutudoxamaxojujevoti.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/fativubusemotisulizowev.pdfIn PDF document text
    • http://artediapharma.com/upload/files/togad.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_off0000ad18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c52f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC52F 10560 bytes
SHA-256: cb0afa636f1f46bf6794615ecd49b6a7286499b1b11e9a5712d03e77ce020fa9
font_02_sfnt_off0000dd4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4E 14632 bytes
SHA-256: d46d8c4ac06c1824095c699d5e349ef9e435ffcaa4fec046f675f7f48003dcf2