Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfd71460114cd00c…

MALICIOUS

PDF

70.9 KB Created: 2021-09-24 16:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5cd3bae75806f4a6baa9ecb6acb3d061 SHA-1: adbdce3acd2014952a38130efdfaa4bb34968b4a SHA-256: cfd71460114cd00cbf88fb959f83375df3d136bdc0143c26586959de41f4fd0e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The PDF also functions as a link farm, pointing to numerous external URLs hosted on disposable domains, suggesting an attempt to obscure the ultimate destination and evade detection. The presence of these elements strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://pistant.ru/uplcv?utm_term=android+device+monitor+in+android+studio PDF link annotation
    • https://hrmconsulting.biz/upload/files/78553872633.pdfIn PDF document text
    • http://nayyaralidada.com/alpha/ckfinder/userfiles/files/megubenofek.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/43724048947.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/ginoxotafuvekikexilib.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/8173852486.pdfIn PDF document text
    • http://ibarugi.com/fckeditor/userfiles/file/84487789104.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/11548803739.pdfIn PDF document text
    • https://mimpishio2.net/contents/files/gosutume.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa6e619170---kupiv.pdfIn PDF document text
    • http://marketingnews.fr/images/file/32269617558.pdfIn PDF document text
    • http://npi-management.fr/ressource/site-image/files/54669383569.pdfIn PDF document text
    • http://gaytonfa.com/upload/files/20710597244.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/85152820184.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/32759077887.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/19883006318.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/58024065503.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///botulokatamojotusi.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/55366395013.pdfIn PDF document text
    • https://swiz.eu/files/editor/nelapib.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/mesiworaxobaloru.pdfIn PDF document text
    • https://jnnjhansi.com/userfiles/file/10650183619.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/22935940439.pdfIn PDF document text
    • http://ranch.pl/files/file/13967266047.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_off0000afb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C2 17952 bytes
SHA-256: 63c87f9b617f98862bf28e5630a0dc36c9dc58a3098e3894e5e6c93d74eebaaf
font_02_sfnt_off0000f5cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CB 10632 bytes
SHA-256: 830e3573e84e8bc2b1d4607dfbbd59b835acf601e69286e39b111adbd8bfa9a1

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