Malicious PDF — malware analysis report

Static analysis result for SHA-256 3241da13dfbfaed2…

MALICIOUS

PDF

68.6 KB Created: 2021-09-28 10:25:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 74ec88df2b5d5946ecbc7e90498bf7f3 SHA-1: 0f23a7210ffee418eb4f342586c5abe8c8a6f819 SHA-256: 3241da13dfbfaed2d845cfa3e3be6780dca47245b1ace20287923fe8f9ff4f29
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous external URIs pointing to disposable hosting. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and URL patterns suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://synerhu.ru/uplcv?utm_term=step+1+first+aid+2020+pdf PDF link annotation
    • http://twinmd.ru/userfiles/file/70747732350.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/beviwude.pdfIn PDF document text
    • http://naturpix.ch/cmsimages/file/gezajibutezagirej.pdfIn PDF document text
    • https://pyccenter.com/images/Upload/file/jobirowexo.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/47670339470.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/27752849910.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/vafajiwos.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/8dfba3dc5bbd75da8afcd45669bdba48/45514712907.pdfIn PDF document text
    • http://mosme.org/uploadfile/files/32408020296.pdfIn PDF document text
    • http://hcm-invoice.vn/hinhanh_fckeditor/file/bewewunadi.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/50578987293.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202109012203503080.pdfIn PDF document text
    • https://tekmaker.com/upload/files/zexegawenosejidixut.pdfIn PDF document text
    • http://recuva.kr/upload/fck_img/1631350961/file/buxetutajiwowe.pdfIn PDF document text
    • https://csam-villepinte.org/uploads/images/file/wiwudeb.pdfIn PDF document text
    • http://kbo.pl/ckfinder/userfiles/files/jediwulal.pdfIn PDF document text
    • https://www.nbc.com.vn/ckfinder/userfiles/files/xutos.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/3717740341.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161361096762ec---xidujumoragofopukujuf.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/muloruxe.pdfIn PDF document text
    • https://kildevangen.dk/files/bopunoravoxunixi.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/lewag.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_off0000ad2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC541 15512 bytes
SHA-256: d27c05b889a1e32aad00fb0d7c1c48e1c5e6a1fe56f9ffebe0bc4f77cbbe858f
font_02_sfnt_off0000ecbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBD 10588 bytes
SHA-256: 940966cfbf1b8cbd379f4aa9344d4c1980e72764393f0b4a8a7df47d38f30c44

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