Malicious PDF — malware analysis report

Static analysis result for SHA-256 7135c1fb75154587…

MALICIOUS

PDF

81.5 KB Created: 2021-09-17 00:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 65416aba2fe9baa097e8986cd244a30b SHA-1: 65e500c0f99b56beca6541b8ccd054106b4fb51a SHA-256: 7135c1fb751545876a31bd5b3ceafe82b96bb5ef005daea5f3bedfbb556cec49
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high number of links to disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=android+screen+off PDF link annotation
    • https://anukulagrotech.com/ci/userfiles/files/45387420143.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/63476036167.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/senineriwodib.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/wodobawezapusupelegeruk.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/50189400254.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161366b4181c4b---7309540552.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/pigokezajesexojun.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/tifosig.pdfIn PDF document text
    • https://singlespeed-switzerland.ch/userfiles/files/tixotagetudabi.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/52256893728.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/98656148198.pdfIn PDF document text
    • https://mkontroll.hu/File/zetipibugu.pdfIn PDF document text
    • https://eastmangroup.org/ckfinder/userfiles/files/87423276683.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/69369845548.pdfIn PDF document text
    • http://rideco.hu/upload/file/23623266519.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/52374804541.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/30858579480.pdfIn PDF document text
    • https://slotsonline.ro/app/webroot/files/userfiles/files/9116729857.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/14235912989.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021091618134673499.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/94202443983.pdfIn PDF document text
    • http://xn--4k0b43gkwo4gn.com/upload/editor/file/84553033098.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/winejegorojadage.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_off0000db72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB72 10144 bytes
SHA-256: 4d897d8c3a23b45ef9289b4cd05118ef95b754ae36cae560bf899fee78501362
font_01_sfnt_off0000f238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF238 17936 bytes
SHA-256: 648fc9042a34fa677e1d9ce9b014afd9d7cbe4541d398cf8cfeeed8876ff780a
font_02_sfnt_off00012095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12095 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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