Malicious PDF — malware analysis report

Static analysis result for SHA-256 da77f5a4ff179311…

MALICIOUS

PDF

76.2 KB Created: 2021-09-14 13:49:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c4bb2c91eec4e2c1c05c5125a988c0fa SHA-1: d97d4a30c7e4b42a6d2456411fade42ea6c6c066 SHA-256: da77f5a4ff179311b47f29214c7cb47d4c591aaf04203cfdd096013bbe9ac397
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to potentially malicious websites. The presence of JavaScript suggests an attempt to exploit vulnerabilities or perform actions within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=tom+and+jerry+meet+sherlock+holmes+full+movie PDF link annotation
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/zumaxopigedufonogo.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/betifero.pdfIn PDF document text
    • http://www.aragonemprendedor.com/userfiles/files/94288292525.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/duzutematugofetafonikita.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/50381352052.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/padozudusiminasokesige.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/95870656889.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/eefb83355b8978103394e70ae7b83f19/nufof.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/gegomog.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/bekoxabixab.pdfIn PDF document text
    • http://lmnn.ru/userfiles/file/vujaxiboju.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eaa077f1d0---wipapibasolulaz.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/jubobejuvimafibilomita.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/35797437609.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/47899356817.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210913145612.pdfIn PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/ropekodowuwim.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/vamenonepazale.pdfIn PDF document text
    • http://moutierrozeille.fr/userfiles/file/82552493332.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/jejakupufutazif.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/83248025088.pdfIn PDF document text
    • http://symbolfoods.com/files/file///kafuwobejugelabejapiwotek.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_off0000c114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC114 18268 bytes
SHA-256: 86570adc0533f12334fb10810b56b0dbda7960bd78433434458e9b792d4719a5
font_01_sfnt_off0000f13c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10953 11208 bytes
SHA-256: 0d8fdd033b021eb8edba9c417d1c38a38ce9f61d8933178e0efda312dc7c0c56

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