Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e6264f7660406da…

MALICIOUS

PDF

96.4 KB Created: 2021-04-26 09:44:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: bd246d41c5b95b8aa5c5189936b1d09b SHA-1: 298e8e86a6b348e5169bd3346600a11ea6ce6934 SHA-256: 6e6264f7660406da323ee5b14ca2f51bf84e8df8b934746120295d0cd8609d10
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF that contains numerous embedded URLs, many of which point to disposable hosting or redirectors, indicating a link farm designed to obscure the final malicious destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://leonvi.ru/strik?utm_term=modelos+de+gesti%25C3%25B3n+de+inventarios+pdf PDF link annotation
    • https://wogivanozo.weebly.com/uploads/1/3/4/5/134586267/besulamozureb.pdfIn PDF document text
    • https://cdn.sqhk.co/nazamesuwute/gHjhNpm/freeze_dryer_for_food_storage.pdfIn PDF document text
    • https://cdn.sqhk.co/kopilixa/iEar6hg/history_great_battles_medieval_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/rerunaropiz/2jhgfhj/51678073411.pdfIn PDF document text
    • http://dusibarupuguli.medianewsonline.com/wedding_march_piano_notes.pdfIn PDF document text
    • http://manibupefif.mypressonline.com/jiwemadive.pdfIn PDF document text
    • http://vurejowug.mypressonline.com/5178546509.pdfIn PDF document text
    • http://lotibamuzuti.scienceontheweb.net/dovivataxopalawakegojo.pdfIn PDF document text
    • http://ganoget.scienceontheweb.net/anaconda_python_tutorial_deutsch.pdfIn PDF document text
    • https://mixosikopas.weebly.com/uploads/1/3/4/3/134383158/38c52c761.pdfIn PDF document text
    • https://lavafijaxeb.weebly.com/uploads/1/3/0/7/130740432/6945963.pdfIn PDF document text
    • http://vowuzemiru.medianewsonline.com/las_amistades_peligrosas_libro.pdfIn PDF document text
    • https://xebazasasixuj.weebly.com/uploads/1/3/4/6/134641459/3cf8dfc75c599b.pdfIn PDF document text
    • https://vunulenib.weebly.com/uploads/1/3/2/3/132303041/xixuxad-jefokor-dekoforoj-tijofiku.pdfIn PDF document text
    • http://kusukeluwabe.mywebcommunity.org/anandabazar_patrika_bengali_newspaper_today_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/921107d2-df7b-43fb-be07-2a07ff726961/vowowadoremive.pdfIn PDF document text
    • http://pekomuvave.myartsonline.com/94966989706.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b93222a-c17d-4900-a392-f6f327439ef3/84340876574.pdfIn PDF document text
    • http://vasakuzepilaxi.onlinewebshop.net/a_fast_string_searching_algorithm.pdfIn PDF document text
    • http://bumejefivoxigo.myartsonline.com/90328461258.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4835ceac-6155-4aee-ba8d-ed7cc9c51b7f/23580303281.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7a6b54d-2487-47cd-a262-c54b65727f8c/55881397538.pdfIn PDF document text
    • http://namakanexir.atwebpages.com/98099940137.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001387f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1387F 5412 bytes
SHA-256: 6102e8ce52de1434356653e43296415d2ff846c31aa5e63a04bbadeccd933fa5
font_01_sfnt_off00014acf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ACF 12172 bytes
SHA-256: 99f8a8598d2cb7c29908bcbe18c956d9b137e1bc81fc5e73db4b90fbc6410633