Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb91495eee45011b…

MALICIOUS

PDF

70.2 KB Created: 2021-09-30 11:29:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: faa32665df589f8a2eb49ef806e82add SHA-1: bc96cd5eed82b79a226cb16697e2de19d8ae8e60 SHA-256: fb91495eee45011bf848a16dbe1902f778e0ac241a526b116715e471936383fd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to PDF files on various domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination. While no scripts were explicitly extracted, the nature of the embedded URLs and the PDF format itself often implies the use of JavaScript for exploitation or redirection, aligning with T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://wolfpackbasketballacademy.com/content_docs/vomeloxupi.pdf In PDF document text
    • https://trieurodata.ro/images/file/wexideletuxilirovajup.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/demosobekafewewezuguwil.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/zewexovuduxokakugawaz.pdfIn PDF document text
    • https://f2h63c2.ip4secure.net/upload/files/zusutiwomibab.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/56151994628.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/35819951673.pdfIn PDF document text
    • https://lp-tracking.com/userfiles/file/29364981444.pdfIn PDF document text
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/gevifugigoweto.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/54019765071.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/6150c0a19cc3c.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/39423783901.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/mr4lberq3i652388ls8tfs2rti/pokuzitezumigivitejo.pdfIn PDF document text
    • https://biocoils.com/img/file/17311853597.pdfIn PDF document text
    • https://vili-al.com/uploads/wysiwyg/files/kuxiwuvunumititudizupab.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/25436695020.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/52358147350.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/45038051611.pdfIn PDF document text
    • http://techniq.ae/admin/uploadfiles/file/47737943163.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/wuvez.pdfIn PDF document text
    • https://www.terraton.com.my/ckfinder/userfiles/files/42821897412.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/sevudoveresogavepaw.pdfIn PDF document text
    • http://charolais-hessen.de/write/userfiles/file/xunimi.pdfIn PDF document text
    • http://mastervgtour.by/var/upload/file/tivetetoxasisup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=gta+2+apk+for+androidPDF 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_off0000b010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB010 10396 bytes
SHA-256: fc9b0967c1458fef40eacdda1852272bd8286011968370cc128ad70d685e58d5
font_01_sfnt_off0000c7c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C2 17128 bytes
SHA-256: cf5d04d24eaa2184bc485a8469eefac6a571beee4566d14d9cc74bfafb8aa5ed
font_02_sfnt_off0000f373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF373 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1