Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8392c2ce4b5fe6a…

MALICIOUS

PDF

71.9 KB Created: 2021-09-11 00:44:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 33cea9ab36701280541ed1179adbb533 SHA-1: 8eaf262446b88d0c9f168cb90e30b576cfb44ea5 SHA-256: e8392c2ce4b5fe6a6f23314a1ff5944a313456e460b566256cfae1bbf1014e05
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of link farms on disposable hosting, suggesting a phishing or scam attempt. The primary lure appears to be an 'acknowledgement for job offer' directing users to a malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://coretry.ru/uplcv?utm_term=acknowledgement+for+job+offer PDF link annotation
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/1n70tsen3ah3g46jro5ap4bdf6/61784960199.pdfIn PDF document text
    • http://aurangabadptti.com/ckeditor/ckfinder/userfiles/files/50465971153.pdfIn PDF document text
    • https://chineseclothingonline.com/File/85407791589.pdfIn PDF document text
    • http://sjhtractor.com/d/files/wetew.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/1v45phs0q9t28lr816qs9hpfer/japumebimobudosupep.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/xemujolopatevinatikerut.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/47946811109.pdfIn PDF document text
    • https://zakarpattya-tour.com/upload/9015547588.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/49111487365.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/zuvutinomi.pdfIn PDF document text
    • http://sungder.com/upload/20432745744.pdfIn PDF document text
    • http://workontext.ru/media/file/33233258250.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/latonisuxivopafejev.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/wamijudadek.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/73508566653.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/lomerinibake.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/67471087702.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/zifedurerewogelubewon.pdfIn PDF document text
    • http://yuanjiangchem.com/upload/files/95121601746.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/jimoruvabotudamerotuxoxuv.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/65958050602.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/8390745992.pdfIn PDF document text
    • https://clickbox.ro/images/file/41224506185.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/25220933316.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/girejazuwegevuzol.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_off0000b9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1ED 10828 bytes
SHA-256: 4ff720ee0c6c45d682bfb1fbc67a70643c165043e38c3bc68f1b088f13088023
font_02_sfnt_off0000eac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC6 15456 bytes
SHA-256: ea3e7e5332c49ad409b5e19754716dd3319dabee7141ce44dafba766bd324fe8

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