Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfdb1390f1e655fc…

MALICIOUS

PDF

86.0 KB Created: 2021-09-18 21:46:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ae521e1fa8998b1ef34f91d3c0b8c124 SHA-1: 8d5ac27403d1c03f84247a68eea2985049a3840f SHA-256: bfdb1390f1e655fc994b7bfb394708da04162ac59d2c3da9289ac024c47c634a
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 a link farm, suggesting an attempt to manipulate search engine results or distribute additional malicious content. The presence of external URIs and a link farm heuristic indicates a focus on directing users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://geofer.eu/userfiles/files/6898658768.pdf In PDF document text
    • http://bright-inter.com/file_media/file_image/file/45889173276.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/69665145183.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/2109428448.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/95587308499.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021090419442173499.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/siwixirufub.pdfIn PDF document text
    • https://promise-land.com/upload/file/82077129745.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/41551066131.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210909071716974.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/loruxevotamolaf.pdfIn PDF document text
    • https://pre-www.bridge-academy.com/uploaded/ckeditor/files/sifonumekolivuroja.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/jorabenozolare.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/75736236794.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b48880b23a---dufimogalunikajimonamuben.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/14953000132.pdfIn PDF document text
    • http://ekvatorbl.com/userfiles/file/41659000835.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613916c260525---73998468366.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fipubogisaguzejep.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/rulufukixiga.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/fakazeto.pdfIn PDF document text
    • https://unaizahic.com/Files/files/famuporajapuken.pdfIn PDF document text
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/23704296630.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=the+kite+runner+book+pdfPDF 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_off0000ef2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10743 10516 bytes
SHA-256: e8993a7d46e8793981b4c4ab43c3396918b117691fa612827feaf6a5ad4f43f1
font_02_sfnt_off00011ee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE0 16900 bytes
SHA-256: 810f95c3b022a294e5af608f998ff00abc68184cb3e1eefea18846b19e4fe3b2

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