Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfc7cd0a5cb2c58b…

MALICIOUS

PDF

68.9 KB Created: 2021-09-28 01:13:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 398afc1dab892965ccf700beb0447ae8 SHA-1: 802fc6c4c3363486ee9fa2b59a227574ec303428 SHA-256: bfc7cd0a5cb2c58b346add77d8075d4cf9e6ed0ae8b5aab72311be33dfdae586
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to distribute malicious content or phish for credentials. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 http://www.tamtrebinhminh.com/public/files/pegarisisudopimaxi.pdf In PDF document text
    • https://webaprint.be/img/file/37729909365.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/21488982256.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329e0fdf688---poxupekezow.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/dikovisod.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/14808547309.pdfIn PDF document text
    • http://lovepetclinics.com/file_media/file_image/file/mexiko.pdfIn PDF document text
    • http://xn--80aaaaadfwa5aftjhxrkcrg8iwc.xn--p1ai/pict/file/xazelejesakewuxo.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/78152060739.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/milewatobemim.pdfIn PDF document text
    • https://vargyasnekonyveles.hu/kepek/other/file/pofidodibizemuxozik.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/53919560753.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/46379370865.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/sofuvilelowugaguzis.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/29239190040.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/51584195053.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16146a79d7bfb2---38812845627.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/18866307108.pdfIn PDF document text
    • https://designsdubaiukfashion.com/userfiles/file/xuriga.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021092623060773499.pdfIn PDF document text
    • http://keralastatetailorsassociation.com/userfiles/file/91371585225.pdfIn PDF document text
    • https://gad-elhak.com/userfiles/file/vujemekupujepox.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/tunijasezox.pdfIn PDF document text
    • http://citty.org/images/uploads/file/jalekatowopafotorewi.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/72074132314.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/jemizuwosugiputo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=apk+pc+windows+7PDF link annotation
    • 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_off0000b0b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B2 14704 bytes
SHA-256: ab52fff505b0340a05695466b367bc2cd5e8d519d3138ec34ba8a062e7ba4d09
font_01_sfnt_off0000d5a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBE 10176 bytes
SHA-256: 653c77096cf09a10bec030cff1a64963b80d935d17150d74173588b810970409