Malicious PDF — malware analysis report

Static analysis result for SHA-256 6abf645c2aaab084…

MALICIOUS

PDF

73.0 KB Created: 2021-02-25 03:39:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ed545bc06edb378908a3f6f974104f2a SHA-1: 54d20fc7c7259f571ad1a68e71e72720386f7dd5 SHA-256: 6abf645c2aaab0847c64194019bf99c0218746c13df12b32413196697006aaf2
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs that redirect to external websites, with one URL specifically mentioning 'project plan gantt chart template excel' to entice users. Heuristics indicate it's a link farm on disposable hosting, and ClamAV detection confirms it as Pdf.Phishing.Trojan. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to deliver a malicious payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/wb?keyword=project%20plan%20gantt%20chart%20template%20excel PDF link annotation
    • http://tixesikixux.mygamesonline.org/46184733093.pdfIn PDF document text
    • https://cdn.sqhk.co/rilixuzewiv/dbLgcgc/fofesuboviruxedewoxolivof.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384628/normal_600685ff881ce.pdfIn PDF document text
    • http://dajexori.mypressonline.com/learn_to_draw_books_for_9_year_olds.pdfIn PDF document text
    • http://gokuluzed.iblogger.org/hotpoint_ariston_aqualtis_aqm8d_49_u_manuale.pdfIn PDF document text
    • https://cdn.sqhk.co/romilononove/ibihRPq/kidawodifezimeru.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxuvedije/hfX7ggM/content_transfer_app_iphone.pdfIn PDF document text
    • http://pebogoginugi.iblogger.org/suvosapolewew.pdfIn PDF document text
    • http://safijejog.mygamesonline.org/nelson_grade_4_math_workbook.pdfIn PDF document text
    • https://cdn.sqhk.co/jimumakevaji/jijehaX/webejunusavi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rojotafapexaj.rf.gd/bluedio_f2_user_manual.pdfIn PDF document text
    • http://gugefojekasarul.epizy.com/ajogbajesu_twins_songs.pdfIn PDF document text
    • http://muzudamufuvase.rf.gd/58918659150.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_off0000e26c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26C 5316 bytes
SHA-256: 821665d0fa4caff8db7a7ce6e8800a86af976f8272b7441c15cae6e505bdb728
font_01_sfnt_off0000f460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF460 10264 bytes
SHA-256: bdeaddc48af947c620d903e5c23869cc8b6d2b925872353d01dbe424bdcba4c0

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