Malicious PDF — malware analysis report

Static analysis result for SHA-256 42e6aa18db06a106…

MALICIOUS

PDF

69.3 KB Created: 2021-09-30 11:45:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 50289213e28486237cd8fcabd70c6bc7 SHA-1: 53602bacd7fee26dc3a7dd5b83b0300b67a2521c SHA-256: 42e6aa18db06a106c48ea6663598f63897be83060dbb381d695abcbfd3f56097
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which are structured to appear as file downloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on disposable hosting, suggesting a campaign to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://nomylo.ru/uplcv?utm_term=minecraft+impact+client PDF link annotation
    • https://goodmix-psc.com/userfiles/files/97709571101.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/jarovamozax.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/21817849599.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/moxijafufonenuzebafazi.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/3001869548.pdfIn PDF document text
    • http://agisinfo.ru/uploads/content/files/kosigagibe.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/migezavavo.pdfIn PDF document text
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/vipigiwadi.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/bizositajapumakisab.pdfIn PDF document text
    • https://videoeffect.ir/data/file/bumuxoginemumobi.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135b0f195029---wovinime.pdfIn PDF document text
    • http://vagyonvedelemszolnok.hu/admin/fck_upload/file/wajeborusa.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/matelebipegozizukujo.pdfIn PDF document text
    • http://maintenancebazaar.com/userfiles/file/46855993291.pdfIn PDF document text
    • http://sjccgy.com/userfiles/file/20760944273.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/vugemomowote.pdfIn PDF document text
    • https://htchninc.com/d/files/benujo.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/fulikupon.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/vasojisik.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/xegirosobipabumimepezub.pdfIn PDF document text
    • http://vrajacreation.com/uploaded_files/userfiles/files/35868292045.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210925150341089.pdfIn PDF document text
    • https://denimder.org/resimler/files/faredawu.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_off0000b174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB174 15200 bytes
SHA-256: bb8f5b5c7dbaee1dd08574109594215753fa0625acc385949ab83a275a5d5111
font_01_sfnt_off0000d869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD869 10348 bytes
SHA-256: f52a129a53178e4410e7daa00d771a4b88fdf1b80569f60ef14a652ea118f7a1
font_02_sfnt_off0000efb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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