Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e1a8636d2a98e7c…

MALICIOUS

PDF

67.1 KB Created: 2021-02-27 12:19:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e2f457c94def29741d63a359ebc10675 SHA-1: e91dd5f4721e51a370bbd1ca8fc06190cb8ddd72 SHA-256: 9e1a8636d2a98e7cd6a1cb501fe84aa1ab9d93ba42dd8f6919b7071315032294
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The document body, though heavily obfuscated, suggests a lure related to 'Schaum's quantum physics pdf', aiming to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/strik?utm_term=schaum%2527s+quantum+physics+pdf PDF link annotation
    • http://meetsucre.pro/website_link_checkeramdyb.pdfIn PDF document text
    • http://good-production16.site/weber_smokey_mountain_smoker03e5a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476285/normal_5ff47d469ca7c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378165/normal_5ff0b96933d64.pdfIn PDF document text
    • http://veritebadisifif.iblogger.org/32201974688.pdfIn PDF document text
    • http://daating19.site/fireproof_full_moviendk0l.pdfIn PDF document text
    • http://runexutofo.iblogger.org/tofado.pdfIn PDF document text
    • http://rm-swis-mine.com/why_is_my_att_router_wps_button_redjjjk3.pdfIn PDF document text
    • http://piwofoterif.sportsontheweb.net/72021374268.pdfIn PDF document text
    • http://fasekafalig.scienceontheweb.net/fojekurigin.pdfIn PDF document text
    • http://retapobu.iblogger.org/cafe_society_movie_free.pdfIn PDF document text
    • http://ninozefumuwu.iblogger.org/aiou_assignments_answers_1423.pdfIn PDF document text
    • http://e-devletodeme.net/weather_report_for_cherry_hill_new_jersey88lly.pdfIn PDF document text
    • http://vvinorama.fun/why_does_shrike_die_in_mortal_enginesjelqh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369313/normal_60368f4cf31b4.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/tumuzu/cbrn_officer_oer_support_form.pdfIn PDF document text
    • http://sogivuwe.onlinewebshop.net/ewi_5000_problems.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_off0000c915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC915 5632 bytes
SHA-256: cf7fd9d7a9315d6aead5614c022d706751d1b2f0a78e2e7bc4939be26c63657e
font_01_sfnt_off0000dc33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC33 10416 bytes
SHA-256: 39892129715b2c5d708a07b485761b9844fea2e9b45db0b168f0f07e61e4ea9f

Open this report in the interactive analyzer, or submit your own file for analysis.