Malicious PDF — malware analysis report

Static analysis result for SHA-256 375a0a9f61065923…

MALICIOUS

PDF

69.0 KB Created: 2021-09-18 00:36:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4b8643d12054c87dae2ff3db2e3e9e30 SHA-1: 31235c02616be83440f873326f4aa00023abb546 SHA-256: 375a0a9f61065923645c726e110ae2aea6157e3a055acc02d6b3d93f205d11de
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to suspicious domains, and a heuristic identified it as a link farm on disposable hosting. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://bio-obst-und-gemuese.de/userfiles/file/72940001784.pdf In PDF document text
    • https://afmiletisim.com/resimler/files/gewidegodigadov.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/fadidowoxebozotiriwebe.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/71451971253.pdfIn PDF document text
    • https://protum.se/file/78824060872.pdfIn PDF document text
    • http://mentaplywood.com/images_upload/files/tomixewemidazinax.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613cbf51945ca---23153701019.pdfIn PDF document text
    • http://szpk.hu/_user/file/pinakeken.pdfIn PDF document text
    • https://asfus.net/virgsurv/userfiles/file/kawonazesapanizededuma.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/kavaxosudekoronepusawiz.pdfIn PDF document text
    • http://offerparts.com/upload/files/39581602657.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/51885364337.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/47905652846.pdfIn PDF document text
    • https://bharatbiodiesel.com/userfiles/file/kuleriparuro.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/kagelezokazimute.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/joxitewerozujazabumijej.pdfIn PDF document text
    • https://zoldlaptop.hu/ckfinder/userfiles/files/rafawuxiximirogerurakunit.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///fiwix.pdfIn PDF document text
    • https://www.utn.ac.cr/sites/default/files/files/77555306544.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/jbl25m8rbqidlhc4p1jd4kg0q0/javadofakobebew.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/sepatekolulavasi.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/dusogurakaxebipogagometi.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/68838458548.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/nowitovotajenelenawozex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=unlimited+usa+vpn+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_off0000b1e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E7 10600 bytes
SHA-256: 56dbf3ce70492eee66d329d742f4008fbedd4d79e396d3b12524847433032db3
font_01_sfnt_off0000ca19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA19 14400 bytes
SHA-256: 5c2815f7c4c40389b0feb7d27cac2b8c8d06d71cd15f8c7fd80d716b058eae4d
font_02_sfnt_off0000ee39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1