Malicious PDF — malware analysis report

Static analysis result for SHA-256 6638206847d9df4b…

MALICIOUS

PDF

86.4 KB Created: 2021-09-17 11:11:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7c7c172df3ac178412b6a5ef250ae7dc SHA-1: 422b4c35ceb5703a7025478c316c0b2d6996ccc8 SHA-256: 6638206847d9df4b453150131489898f738a2ad7454e88d7513eba407c3b14b4
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs pointing to disposable hosting, indicative of a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=add+ons+kodi+2021 PDF link annotation
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/161400ac00bb10---jegifomef.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/36552471506.pdfIn PDF document text
    • http://relaxzenter.com/uploads/files/19644845440.pdfIn PDF document text
    • https://rajatotogroup4.com/contents/files/luboti.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/tiwifuwose.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202109150154477763.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/xizevemom.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/61512928518.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/mijavudemowa.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/puvimakijini.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/vewutusifipozinitugawaf.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/ripudovut.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/60640585877.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/lifeligutumukipupuda.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/15966223489.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/feredubewipogekofaz.pdfIn PDF document text
    • http://roseeskin.com/userfiles/file/20210906025623.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/746238685613a0471ad3b4.pdfIn PDF document text
    • https://www.l-games.jp/js/ckfinder/userfiles/files/livinopo.pdfIn PDF document text
    • http://dwornawodzie.pl/userfiles/file/zitew.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/rezinetolajenatozakoxagi.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/vudutamijuvakikize.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/fokozeduvape.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/46007214725.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_off0000ed0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0C 18464 bytes
SHA-256: d0e1e9725f548ce2b177e633fa5f2eb64a16b501cb58ed1eca5fdd2a5b597ed0
font_01_sfnt_off00011d61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D61 10072 bytes
SHA-256: 80335cafbc50f9346f9ed887751bf002f2d22886e3391b0a94e3c188b6e5444c
font_02_sfnt_off000133f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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