Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ef55ee698d5b4b1…

MALICIOUS

PDF

82.0 KB Created: 2021-09-18 01:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e6d517503fe71c170a92f27e1c7167d1 SHA-1: 369df2dd030336f0f7597df6b393133105a0a1ba SHA-256: 8ef55ee698d5b4b1cb44268292ad7715d7e2cd20ab12f6883ea59c3eacf8e965
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous links to various PDF files hosted on disposable domains, suggesting an attempt to distribute malware or phish for information. The presence of external URIs and a link farm heuristic indicates a malicious workflow designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cl-pub.com/files/files/riwukosuxezotume.pdf In PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/ruraliv.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f3a486ae2---nilis.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/xepebof.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/pulaxapuga.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/73079978139.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210907060744659.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/47819623662.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/bipixosameretezed.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/siwakikusuge.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/66597760027.pdfIn PDF document text
    • https://luminex.pl/upload/file/43719626237.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/23426314057.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/zebaloma.pdfIn PDF document text
    • https://nycsmindia.org/ckfinder/userfiles/files/bowiwedatoxu.pdfIn PDF document text
    • http://lynxauto.ru/userfiles/file/xamisanividijulu.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/verelaxonepuxawide.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/13860707412.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16141d4754292f---voruja.pdfIn PDF document text
    • http://www.mediagrand.hu/data/editorfile/dedoxuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=mafia+city+mod+apk+whatsappstatusimagesPDF 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_off0000da9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9A 11204 bytes
SHA-256: a4334affed60d65f7b89c38cbce8f9fd40d02a5f2b684482d619f3eb371672eb
font_01_sfnt_off0000f4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CF 17888 bytes
SHA-256: 572c21b2fefc291d1a86fc492c21acacf757e0dc8f3261fb0102e9647c3e3803
font_02_sfnt_off000122c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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