Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e41e604aed32752…

MALICIOUS

PDF

78.9 KB Created: 2021-09-19 11:26:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 621a7f8a33da9d19130fb689a5ac9d06 SHA-1: 81fc01c96a105fe33c2981aec05a4487de04ffe7 SHA-256: 7e41e604aed327526534c0c324f764ea1b410f52d724125e127f0ba3859b9bfb
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 external URIs pointing to disposable domains, indicating a link farm designed to redirect users to potentially harmful content. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://allytemp.ru/uplcv?utm_term=acr+recorder+pro+apk PDF link annotation
    • http://picassogift.com/Uploadfiles/files/35621856891.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/40073288328.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/vupagirimosenodu.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/40167824165.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/688cafba9804b415567db7130968f99d/nuzano.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/61878519507.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/lobegizadonoxerosojojoko.pdfIn PDF document text
    • https://nk-sostanj.si/files/file/bodovugawozapolow.pdfIn PDF document text
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/nulezegawusexaguj.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/xavexijotimupujuveret.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/kelalif.pdfIn PDF document text
    • http://astprom.ru/sites/default/files/file/91794574798.pdfIn PDF document text
    • https://xn--49st2et51duvk.com/upload/files/64571956749.pdfIn PDF document text
    • https://ladymamashop.com/uploads/files/202109150937592497.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16144f615a76cf---mujojilafatubi.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/34919598744.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/77816954297.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/33174580687.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/54007193466.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/jezopalabaferapew.pdfIn PDF document text
    • https://conviviodihera.it/dati/upload/file/63197091199.pdfIn PDF document text
    • http://isvpro.com/custom/files/jadekoduja.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/junitulig.pdfIn PDF document text
    • http://esangsok.com/upfile/files/39683657503.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_off0000d20c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD20C 10072 bytes
SHA-256: a62bc5eb1d3c16ac4956d88c07cce62453eef9df58080b2f0bc464e7ed1c3574
font_01_sfnt_off0000e896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE896 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A8 17632 bytes
SHA-256: 1d7794a24c8d71e004f9bff48bf0003779e1adaa282bc68d929ada8c187de428

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