Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2b7e474f0e6ee72…

MALICIOUS

PDF

88.8 KB Created: 2021-09-11 04:31:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: af390c3ed01d88a1f061fac22c7bd6d2 SHA-1: 35b18c4e373e279459039d4a455055aa42ab7ec3 SHA-256: c2b7e474f0e6ee72e791d3af3267df816cf2e1309b2225b8639fd48e17757841
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded links, many pointing to disposable domains, indicating a link farm or phishing lure. The presence of external URIs and the overall structure suggest an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391e5857250---54086733732.pdf In PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/kurowuwatopizedewom.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/99498304755.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/wipesegobopogax.pdfIn PDF document text
    • http://slabowidzacy.smprzemysl.pl/ckfinder/userfiles/files/45671983399.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/zafisipa.pdfIn PDF document text
    • http://dainindo.com/Uploads/userfiles/files/pizelatusezupudi.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/kibededijorakuvisagag.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/35863684051.pdfIn PDF document text
    • http://fgosvo.ru/files/files/wosifokoladuge.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/gukatof.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/jukavufebad.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/vekamuravofoxikuwafov.pdfIn PDF document text
    • https://inprovitperu.com/ckfinder/userfiles/files/11551649180.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/winufojogapurukisuwibo.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/remanetodori.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/wogaxanatedovi.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/88601577851.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/nudavalafuxexuvoratoke.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/nodovubebomanabibabokabi.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e45353fed---mamuxupevuzemotegise.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/69179553430.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/63541765225.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/89419793277.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/kavusafoje.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/64005683950.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=punjabi+movies+2021+watch+onlinePDF 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_off0000f1d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D4 11212 bytes
SHA-256: b32eb16c56f88a156cd3dfa72316711fd93b7b3bd73941e2e72b017d48a7123d
font_01_sfnt_off00010c03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C03 19132 bytes
SHA-256: e59d4ca7e5444fb0350c6a7f30f736f322cfe6cf7a2cd89aa516c358b9d27200
font_02_sfnt_off00013d83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1