Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec7107565adbb715…

MALICIOUS

PDF

81.0 KB Created: 2021-10-06 05:56:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 0e07fb7cf87fa5ff34815f96548affa0 SHA-1: ce20f6b179babda35ca732b25c078483c5572a8f SHA-256: ec7107565adbb71575bdc38c206af4875759d931e7b362b521124707c0dee343
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable domains and appear to form a link farm, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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.
  • 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://888spirits.com/userfiles/file/25253474861.pdf In PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/rijixeduwelof.pdfIn PDF document text
    • http://sciattella.net/images/file/17488366087.pdfIn PDF document text
    • https://olivermilk.com/tctt/sites/aaa/file/67509370745.pdfIn PDF document text
    • http://transgusto.ch/userfiles/file/71592524850.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d3a0b98a1---zivomelazutujisusozabolo.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/3693846341.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/6766956776.pdfIn PDF document text
    • https://dm288.rs/slicice/file/15177853139.pdfIn PDF document text
    • http://flapboxes.custompackageboxes.com/userfiles/files/27594548499.pdfIn PDF document text
    • http://garankuccu.com/upload/fckimagesfile/7958c5be172269384913f6558a9bc99a.pdfIn PDF document text
    • http://abhinavabhishad.org/userfiles/file/40001578333.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/lejemolisupatekil.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/jijew.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/52836808117.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/81479321442.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/rejixaxokumosoxukomigo.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/13419459939.pdfIn PDF document text
    • https://10fci.info/userfiles/file/sozegugujugubilunugak.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/rebewoxunafanuloki.pdfIn PDF document text
    • https://premium-house.uz/images/file/99724715159.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20211002_4B9058F11C4AC30F.pdfIn PDF document text
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/3141903998.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=career+objective+for+resume+business+administrationPDF 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_off0000d752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD752 17380 bytes
SHA-256: edbc07489b3b1c08746d77f45f86f680fad6faca4b2c24dc65ec38cdb0f5f4ef
font_01_sfnt_off00010439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10439 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C50 11056 bytes
SHA-256: dd6f04ab25dc1c523cfd453f2fe93ed8cda9e29f7b1ddcc96df271b8476e7abd