Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ca0e44042cfdad1…

MALICIOUS

PDF

90.7 KB Created: 2021-04-07 22:07:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3aebdb14e831e50ab7921c7b13647c83 SHA-1: 9718f43064e7bd86a62b58e145123e8c191943cb SHA-256: 5ca0e44042cfdad11a0ae731b3659a3205b773a5eda8fdade06cbe8158802b53
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • 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://midufefew.ru/strik?utm_term=what+episode+does+t%2527pol+join+starfleet PDF link annotation
    • https://xugubevowasisof.weebly.com/uploads/1/3/4/8/134885616/9361801.pdfIn PDF document text
    • https://kemigaguni.weebly.com/uploads/1/3/1/0/131070112/42312.pdfIn PDF document text
    • https://cdn.sqhk.co/dokukavifig/joMZhcI/giziwetarime.pdfIn PDF document text
    • https://lagukowimewalis.weebly.com/uploads/1/3/5/3/135335318/jefosiwuzezeleb.pdfIn PDF document text
    • https://cdn.sqhk.co/kafosine/ic5ia72/vobaseriluripivodexafufu.pdfIn PDF document text
    • https://cdn.sqhk.co/delojiwuguj/ihjchxK/best_chocolate_cupcake_recipe_tasty.pdfIn PDF document text
    • https://kagivosivozavex.weebly.com/uploads/1/3/4/7/134746508/furijuwowusax.pdfIn PDF document text
    • https://kitijudaxedefex.weebly.com/uploads/1/3/5/3/135350735/3393131.pdfIn PDF document text
    • https://cdn.sqhk.co/modojiti/cReghXn/62816112125.pdfIn PDF document text
    • https://cdn.sqhk.co/gajamomol/gf5jctI/suliw.pdfIn PDF document text
    • https://polovetanofup.weebly.com/uploads/1/3/5/3/135330247/3261157.pdfIn PDF document text
    • https://tidixusega.weebly.com/uploads/1/3/1/3/131380021/022a7ecce198.pdfIn PDF document text
    • https://cdn.sqhk.co/zavilisuga/PQQiejc/temple_run_2_games_download_apk.pdfIn PDF document text
    • https://logutidukikov.weebly.com/uploads/1/3/1/3/131380383/5040967.pdfIn PDF document text
    • https://cdn.sqhk.co/modonasuje/jfjjTyd/zevixak.pdfIn PDF document text
    • https://cdn.sqhk.co/kufusivekogo/jdgjjcz/cross_road_blues_tab.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/de501cce-1b4c-4ff1-abe0-f5e592de822a/7259850661.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c705bb5-c76c-4b3b-a3b1-fc82cf3ca0a8/52044271625.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06bf78b5-86e1-4611-934d-59f65d19a9ac/vivitar_action_camera_dvr786hd_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47f805fa-3a9d-4c22-8252-127b5f6d0599/bezujaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9eb0827-d5ab-4654-a57d-770f25a04a0a/35189413420.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/313148cc-9242-4091-b3b0-cda014d4a14c/bubixefujon.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_off0001261f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1261F 5252 bytes
SHA-256: 63fa816eb5ba0075a7999385e2aab288d7e834ba5bc2e532004faae17755c568
font_01_sfnt_off0001380d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1380D 10464 bytes
SHA-256: 88f330611e4b71be2eab17582c719de4f08a8ff37fe061864721dd246822c9a0

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