Malicious PDF — malware analysis report

Static analysis result for SHA-256 edfee82bbc7677a7…

MALICIOUS

PDF

75.7 KB Created: 2021-03-30 01:34:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4c186b5db6cbb859f0d04bcf9fda44bf SHA-1: 77d4debb1f673d706f2da1a7a3cbc8c931222671 SHA-256: edfee82bbc7677a706b7bf0c0d8d6bfbaa818d5be009043e1e32c216dddd00e4
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used for SEO manipulation or to redirect users to malicious sites. ClamAV and ML classifiers strongly indicate malicious content, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to lead users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/123?utm_term=adenitis+cervical+ni%25C3%25B1os+pdf
    • https://cdn.sqhk.co/tarudifirew/hhigHhc/58117257434.pdf
    • http://support-copyrighthelpservice-about.com/sesepoi6px8.pdf
    • http://yarrebitteh.online/zumavur4uxng.pdf
    • https://cdn.sqhk.co/mofipife/iiahbgh/mx_player_apk_download.pdf
    • https://cdn.sqhk.co/felolavap/nGjgi1x/under_seat_storage_chevy_silverado_2020.pdf
    • http://pinopizo.sportsontheweb.net/37038839312.pdf
    • http://byt-upak.ru/jasmine_plant_growing_guidenci1v.pdf
    • http://lamovingcompany.com/16789057241o7yjs.pdf
    • https://zetojaxonafavop.weebly.com/uploads/1/3/5/3/135309172/fb873f5f2de.pdf
    • http://xolixelov.22web.org/ravujedesibinup.pdf
    • https://cdn.sqhk.co/sabumijobude/egnijhh/black_desert_mobile_best_class_for_farming.pdf
    • https://xuvuluvibes.weebly.com/uploads/1/3/4/4/134494650/4752757.pdf
    • http://pearhaidhr.fun/wuvinaramidoxokidekat9pljp.pdf
    • https://webexozaputer.weebly.com/uploads/1/3/2/6/132681415/kajedidegunagibab.pdf
    • http://tuvosudokalidu.scienceontheweb.net/terojisarapolibiririzo.pdf
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tuxigufujera.rf.gd/understanding_computers_today_and_tomorrow_13th_edition.pdf
    • http://lawijiba.rf.gd/wageno.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8ca.bin
7f6e3de911d566edd6efb5584faf3e3b688ef486c72ed45508ee7d8459802cf0
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CA 5412 bytes
font_01_sfnt_off0000fb06.bin
75f32dfc7dc63a0d5990ce55349e027aec231aad1c7353f9cb43c4911a3d90c6
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB06 11300 bytes