Malicious PDF — malware analysis report

Static analysis result for SHA-256 26d96dd0276d442e…

MALICIOUS

PDF

74.4 KB Created: 2021-09-19 15:59:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4077c138bbb24b6967c81a8cbda783a9 SHA-1: df01b72b62a58d5fe09e7b041edf25ee06f64f11 SHA-256: 26d96dd0276d442e18de6280c6c1f417de0cf5aa3e4d96c28392813dd5e8b450
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism. The PDF structure and embedded content indicate an attempt to disguise malicious intent, likely by directing users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://daotaonhaccong.com/uploads/userfiles/file/1644328372.pdf In PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/56207674245.pdfIn PDF document text
    • https://chineseclothingonline.com/File/17749641517.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/zidofixig.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/xabizoduvamogowokibagilu.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/jipisagovaziri.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/sorekasive.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/gagetifodizubejodavediji.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/lamub.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/71113771250.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/98173033077.pdfIn PDF document text
    • http://ideal-site.ru/userfiles/file/74323837012.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/kudegasoxugesokuniz.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/99000365300.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/lewirumekogoxewosimujiwo.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/94390241343.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/0829stg30qp8o5fc0pedruasj0/53752430085.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/jowugez.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/27394346031.pdfIn PDF document text
    • http://tyextractor.com/d/files/pegomarufonilamejezew.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16135c0986629c---94747644801.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/39597729962.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=mosquito+repellent+apkPDF 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_off0000c07c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC07C 16784 bytes
SHA-256: f8fac4cfbfad66878a7a4340650708c99ab57cb4d9d2a6493ca956715f5feaae
font_01_sfnt_off0000ebb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C7 10576 bytes
SHA-256: bdae7fafd11ea75e502e758370e3bf9586caee90281563c891bc3a903438caa6

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