Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbe29d8557c21350…

MALICIOUS

PDF

76.9 KB Created: 2021-09-16 13:03:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 41af0aec981ba7f94ae2f0dfbf508db1 SHA-1: 5532967d23ce576b85d5e9fdff5713f6f10c9324 SHA-256: dbe29d8557c21350141ca94f8a1ed2e422ad12ffa46999a20147b724f95a80b3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to external sites for further exploitation or credential harvesting. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://synphabase.ch/upload/file/dopok.pdf In PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/98810603748.pdfIn PDF document text
    • http://forepic.com/_UploadFile/Images/file/22582636923.pdfIn PDF document text
    • http://xn--h1aeekk.xn--p1ai/files/file/55951161973.pdfIn PDF document text
    • https://wildnaturetravel.com/File/95829153725.pdfIn PDF document text
    • https://km2804.com/ckupload/files/29271664912.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/17182574133.pdfIn PDF document text
    • https://noventa.cz/media/files/file/rorinexenatafugu.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gamireferowinuvib.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/24399985079.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/lanujixolalanogafaga.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/fevumoluvunuzenimoworal.pdfIn PDF document text
    • https://ptogel1.com/contents/files/jekisa.pdfIn PDF document text
    • http://zimmerei-possert.at/41322985899.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/20050266433.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/78093101379.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/320495e3232334c84da0d9aa5bf86f65/77812790447.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/zediwe.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/dejazo.pdfIn PDF document text
    • http://investgeorgia.ge/userfiles/file/sokebobafujaxepe.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/iro93q1cm7ufiihibc1g91g8e5/49070648932.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=the+avengers+film+onlinePDF 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_off0000c9ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9EE 17056 bytes
SHA-256: ec055549ae75c6ec0fbc7ae331a54770fc6354080c4cc51638bcc3b27f53be08
font_01_sfnt_off0000f635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF635 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4C 10592 bytes
SHA-256: 9d8571cd1bfb7e3a5b8b5f8a71810c7652b8e308a5cb5e0b011fa3ebdec5e63f

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