Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b1c4c0a0cbb1e57…

MALICIOUS

PDF

84.1 KB Created: 2021-09-17 06:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0054e9d62cd2782538a20ed30cb350df SHA-1: 270089379302485e92f8f65ce1dc0ead4609c023 SHA-256: 0b1c4c0a0cbb1e57d579ce3f628d33813c0f201f5821e12319bacb5fc6f9bb75
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a large number of embedded URLs, many of which point to disposable domains, suggesting a link farm or phishing lure. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to redirect users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://wellnesszeewolde.nl/site/data/ws/files/25359301373.pdf In PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/73721984829.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/konezubetakunupoxujevaz.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/31697540882.pdfIn PDF document text
    • http://goldenmallbiotech.com/upload/files/50863724203.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161389486e5312---sefozukezigukog.pdfIn PDF document text
    • https://technoarc.net/userfiles/file/kefuribagozedewokugut.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/32601326677.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/diwudizebepujiv.pdfIn PDF document text
    • http://theponghop.com/upload/files/61256720023.pdfIn PDF document text
    • http://tprcindia.com/ckeditor/ckfinder/userfiles/files/38004044756.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/89243351892.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210902050343.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/kezubu.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/xodunubu.pdfIn PDF document text
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/19230292728.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613241837e8cf---37877544216.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/nuwav.pdfIn PDF document text
    • http://telektrans.hu/editor_up/65765489508.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/pigunugegesufurexudukiro.pdfIn PDF document text
    • http://marketingnews.fr/images/file/tudalufazudekerexuruxeb.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/kapexolabut.pdfIn PDF document text
    • http://jamones-luna.shopcloud.es/ckfinder/userfiles/files/74917415618.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=truck+simulator+indonesia+gamePDF 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_off0000e692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE692 16932 bytes
SHA-256: 20a6d9762cc45de9aaa68e85ce38d657a4d266022190c8e4e3448cfcda945275
font_01_sfnt_off0001123a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123A 10868 bytes
SHA-256: 00d9d419452c9de8dd23a27d193e90b9bcff85207c1ddeba98ee04ca05ee94c2
font_02_sfnt_off00012b28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1