Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbf876f52b8ade39…

MALICIOUS

PDF

81.9 KB Created: 2021-09-08 23:22:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 13c092e7eec32b17d0fa7bc97630b707 SHA-1: aa59c21c4ea2c136bded3f481a38aff2d1866bd3 SHA-256: bbf876f52b8ade39bf75318b814ffb413d2e95dbae6db165cc394c961fe42785
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous external URIs, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://krisoc.ru/uplcv?utm_term=photo+video+maker+with+music+download+apk PDF link annotation
    • https://yocarbroker.com/upload/ckfinder/files/62959039515.pdfIn PDF document text
    • http://kiapelhrimov.cz/UserFiles/File/19432805173.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/34290564673.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/6257983429.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/desuvike.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/9366564732.pdfIn PDF document text
    • http://gospelpour100voix.com/fichiers/newsletter/file/94314790935.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/fubirifakepanarawuze.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/49044045505.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/74584901300.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/66202814113.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/43117577603.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/46092018955.pdfIn PDF document text
    • http://favourtec.com/attachment/file/miwojez.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/mavikake.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/71012622988.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/xatapadepumazili.pdfIn PDF document text
    • http://xsteelstock.com/d/files/reximubejok.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/gasowamonitimi.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58861425379.pdfIn PDF document text
    • http://marketingnews.fr/images/file/gatuv.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/85306418220.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/e6b08b130c7bdef6ed25f724ea551ec4/78022001314.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/tolaz.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/28839131665.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_off0000d857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD857 11124 bytes
SHA-256: a57559038da77c59fd65e0930b5a6c5e37eaf03ce037287eaf2dc24fa9661426
font_01_sfnt_off0000f236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF236 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A48 18224 bytes
SHA-256: 10d7c9172add2e22b7b598ccf5adfd390546a166ebf27805bcf8a32f621ff20c