Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdbd40fd6790f5dc…

MALICIOUS

PDF

82.1 KB Created: 2021-09-09 19:32:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2a899a94269026a6b0c176232082b2c9 SHA-1: abbd25f295496ebed5930d2815da532f592ef93a SHA-256: bdbd40fd6790f5dcab3d9f4d91d025805264bedffa1fe1870680e76c5f2e0ddf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, and a specific heuristic identified it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of many unknown reputation URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://kovofilm.cz/userfiles/file/dalapod.pdf In PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/28341223729.pdfIn PDF document text
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/babugawunogadifesova.pdfIn PDF document text
    • http://www.agot.pl/upload/file/sejugifubur.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613912f945621---gudumewabajinizafetukej.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f5c61b39b---50240932982.pdfIn PDF document text
    • http://dar-tom.pl/userfiles/file/rilubo.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/tidikaduzilixotabi.pdfIn PDF document text
    • http://lerucherdesanges.fr/userfiles/file/25775325634.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/xijivakasa.pdfIn PDF document text
    • http://www.ekoforte.com/upload/file/gasonexibisuwir.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/zalusuwalakove.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/lobowosi.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/202199_191945_783.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/wolep.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210908/2319366429.pdfIn PDF document text
    • https://advik.net/userfiles/file/33524080790.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/bezuvusunepev.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/14109966222.pdfIn PDF document text
    • http://net-marketing.hu/images/files/38270697861.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/rufimesoridifane.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/44037524414.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210908/files/20210908102533.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=kinds+of+rainPDF 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_off0000df5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5B 10060 bytes
SHA-256: af5c7e1c00f636ab9a56755561363fa03a25b5e539ed881754dafec603225fe9
font_01_sfnt_off0000f5c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010dd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD6 17652 bytes
SHA-256: 1811b4be6ce44b91f7a2d78097f5806b65aadd5841b221af881ecebef3527e32

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