Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f54e568f15a4ba9…

MALICIOUS

PDF

80.7 KB Created: 2021-09-16 15:19:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e39b9e596d03727be9a25ba2afe7a6d9 SHA-1: 8863ff4639ec68d2319aa78844783a22620e1e9f SHA-256: 3f54e568f15a4ba9d12297ebd1464357e2626b987c60744a6a18d4ba1b718ad3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous embedded URLs that point to disposable domains, characteristic of a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to exploit user interaction through malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://archism.ru/uplcv?utm_term=dizziness+with+head+movement PDF link annotation
    • http://generaltubi.com/container/ckfiles/files/39308329684.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/16496407828.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/20691538357.pdfIn PDF document text
    • https://tsegypt.com/file/tixowurukagunutoper.pdfIn PDF document text
    • http://aylabawadi.ae/userfiles/file/53317951048.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/32400231688.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/wogevomuraken.pdfIn PDF document text
    • https://alohasafaris.com/files/7425034810.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/43380738629.pdfIn PDF document text
    • http://tomdythai.com/userfiles/files/zadib.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/47299226969.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/suxesetinokavuxu.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/bifonodafaluwiwovora.pdfIn PDF document text
    • http://szcftz.com/upload/2428042947.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/noweguzufidezukusinaxab.pdfIn PDF document text
    • http://sabancilojistik.com/userfiles/file/68387651785.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16141157c75fce---5686217632.pdfIn PDF document text
    • https://grandiosieventinuziali.it/filesUploads/file/50345297808.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/nemozepi.pdfIn PDF document text
    • https://clickbox.ro/images/file/66349779522.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/98879993463.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_off0000d82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82D 17468 bytes
SHA-256: f690d4c25ef657e2860a710d792bebf9ce82df752da7efbf3ff385e91a5a5ed0
font_01_sfnt_off00010590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10590 10580 bytes
SHA-256: 97711bdea826c6c864bbcadc3642e00ac777b86b226391d9b7a0275e505e8616
font_02_sfnt_off00011da5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1