Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea8d82f08cbae319…

MALICIOUS

PDF

79.8 KB Created: 2021-09-19 10:53:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e6ce76e74ff89d292f25f0cd7fb912f7 SHA-1: ae1e34cf7a507ba3bf666470bd231c6eb92fdd9b SHA-256: ea8d82f08cbae319222443b0e62697da3b3b4eca6348f91a680c1c01dc89aa84
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, many pointing to disposable hosts, suggesting a link farm designed to trick users into downloading files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URI patterns are consistent with a downloader or phishing lure.

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 https://excellencetogether.com/img/files/file/jijidimekotexukil.pdf In PDF document text
    • https://meritumptt.pl/dokumenty/file/rerowixijute.pdfIn PDF document text
    • http://i-tos.com/userData/board/file/90816962442.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/81720349562.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/48388556184.pdfIn PDF document text
    • http://ahzgbh.news-read.com/upload/files/tubani.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/vudax.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/bejosinozejejalu.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/jinusoxol.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/64138294991.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/xesodege.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/28356807634.pdfIn PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/gidovadivoz.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/zenojepudewubugujit.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/54159525187.pdfIn PDF document text
    • https://777mto.org/contents/files/gujanasixuterujemupa.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/4334279550.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210907155028.pdfIn PDF document text
    • http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/rudurupasip.pdfIn PDF document text
    • https://marosme.ro/hirek/file/77219687893.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=modded+app+store+apkPDF 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_off0000d3e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF6 18328 bytes
SHA-256: 3d153ebd4683cd8f11dc05e917c253fc75ad1cdddc9256090c1a00033a5efa03
font_02_sfnt_off00011b2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2E 10228 bytes
SHA-256: 6d0767dffc77fcd56977d474e0ed1b0023d2924df2664c18eed1447f81924234

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