Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9eda1a12d5f2fba…

MALICIOUS

PDF

79.8 KB Created: 2021-09-20 19:23:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: a30ac301bf635711756134ee21c78c0c SHA-1: c45b91b8fce2ab47e834b5a843e157e657dc649c SHA-256: b9eda1a12d5f2fbaf041a758f95596b3c8f5fe5a4ce026edb546d67b01d24314
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, suggesting it functions as a link farm to distribute malicious content or conduct phishing attacks. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a deliberate structure for link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://wastran.ru/uplcv?utm_term=best+drawing+apps+for+galaxy+tab+s7 PDF link annotation
    • http://ch-yang.com/upload/files/73948878150.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/nokepude.pdfIn PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/81567271436.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210906082153119.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/34721093116.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/nezarozejenurewupenoraso.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613548fe66f7b---susimizefovoxikudomegare.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021090321328_239729954.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/84867951169.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/17918513371.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/famozusorazakegazelawu.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/woposusemixidaji.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/bemel.pdfIn PDF document text
    • http://tnmetalworks.com/images/files/91629524205.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/jedeled.pdfIn PDF document text
    • http://highgaincomposites.com/img/file/20219495137.pdfIn PDF document text
    • https://rotitelor.com/contents/files/denobototiliwi.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/5dbeae9617f1949c66f78b5e078bdae6/felozapogijexunifobexaken.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/buzagaki.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/80225539888.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/bagidikubovogawedago.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210910_C3A1CA938B8BF16B.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/xeburakifabenevumef.pdfIn PDF document text
    • 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_off0000d502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD502 16316 bytes
SHA-256: 6cf9855578383bc37871ee58c2ff9625584a3635164541070cb90b6be784e44b
font_01_sfnt_off0000ff73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001178a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1178A 11216 bytes
SHA-256: 7a9ce79aa91e2dc8023ddb39caef31e9e3f825e0b26accec322cb18aeb39cce9

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