Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9a3662605ad392e…

MALICIOUS

PDF

72.7 KB Created: 2021-02-17 01:41:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 47d0f47bc9801b666369c9a5be36de51 SHA-1: 2700d84fbb7fdfbc0bb848095f611c1ac6bdfa78 SHA-256: b9a3662605ad392e579a9c6773fa2add8d5b0376be127c65f0fb3452a0997b11
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host and distribute second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://druttle.ru/wb?keyword=computer%20basics%20for%20beginners%20pdf PDF link annotation
    • https://cdn.sqhk.co/wunemuruk/Topa9oS/61899208407.pdfIn PDF document text
    • https://cdn.sqhk.co/napefabet/ihAjj44/zudep.pdfIn PDF document text
    • http://pafiwuz.66ghz.com/93095689490.pdfIn PDF document text
    • https://mazokameviseg.weebly.com/uploads/1/3/5/3/135349474/0423ae0bbe2.pdfIn PDF document text
    • https://dapijapivabug.weebly.com/uploads/1/3/4/3/134338952/wakerupugujigulive.pdfIn PDF document text
    • https://cdn.sqhk.co/kawonidoza/hhT2iji/spotlight_theater_bistro_hartford_ct.pdfIn PDF document text
    • https://cdn.sqhk.co/xoradofexul/vghhdii/47517389245.pdfIn PDF document text
    • https://regogugone.weebly.com/uploads/1/3/4/8/134891767/7954560.pdfIn PDF document text
    • https://dobetabuzaduguz.weebly.com/uploads/1/3/5/3/135312815/pizejugu.pdfIn PDF document text
    • https://cdn.sqhk.co/pepupiribojo/1Kdjehf/zebirinitamogaxaj.pdfIn PDF document text
    • https://cdn.sqhk.co/bibunifez/jieHvgj/67552064728.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sewamos/19807967817.pdfIn PDF document text
    • http://zisufabelez.epizy.com/49213209676.pdfIn PDF document text
    • http://fofuxolisemaxim.epizy.com/42141580513.pdfIn PDF document text
    • http://dulefuzobov.rf.gd/72680056905.pdfIn PDF document text
    • http://jojerigexorow.epizy.com/essential_actionscript_3._0.pdfIn PDF document text
    • http://lonidur.epizy.com/gifasu.pdfIn PDF document text
    • http://vobogiv.rf.gd/dipped_products_plc_annual_report_2013.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxalirudidel/beat_pe_booty_remix_song_pagalworld.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_off0000e082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE082 5488 bytes
SHA-256: 2112dcf30a4329d6aede9d03069625d48779026d4c194248c74bd48ece06886f
font_01_sfnt_off0000f307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF307 10208 bytes
SHA-256: 5ca56065bcc51963510a1b54e777e70ec4fa052b14d271979132d272936c4296

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