Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fa9857a5ed960dd…

MALICIOUS

PDF

69.3 KB Created: 2021-04-16 19:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: ccb9b3df6b7cdc2bb51d6c0222fef437 SHA-1: dc0646a806debd989c7dde3975fbcfb43fe09f0e SHA-256: 2fa9857a5ed960dde54dc2c1b9d4ef4f85699d9b3074b05f152043e92f05b908
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to a suspicious domain, 'resalured.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to educational materials, specifically a '6th grade textbook'. No scripts were extracted, but the presence of external URIs and the overall detection profile strongly suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://resalured.ru/strik?utm_term=tci+history+alive+6th+grade+textbook PDF link annotation
    • http://viwafuxofiseko.getenjoyment.net/antrenmanlarla_geometri_2._kitap.pdfIn PDF document text
    • http://gupodorap.iblogger.org/statin_guidelines_2020.pdfIn PDF document text
    • http://toxipoxekej.medianewsonline.com/business_plan_for_online_shopping_website.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/ac0ecea1-6bcf-4623-93b4-62ce09c04755/92389727759.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/is_there_going_to_be_a_14_wings_of_fire_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39019d7a-0956-4a94-92eb-1166aeb25d76/jawiduwatenesivemit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2723a2b2-654d-4f24-80d7-be3af25cfc7d/moxoseredexelubiwal.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/property_maintenance_schedule_template.pdfIn PDF document text
    • https://s3.amazonaws.com/vizegemawokaxe/97261719112.pdfIn PDF document text
    • http://sekuwomexapa.myartsonline.com/howls_moving_castle_book_barnes_and_noble.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/gejopis.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/1-_300_leatherworking_guide_classic_wow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2674efde-2286-4dee-9202-43b6eebfa21b/union_journeyman_plumber_salary_california.pdfIn PDF document text
    • http://kunaraxanoxun.epizy.com/gmo_payment_gateway_annual_report.pdfIn PDF document text
    • http://lejimilegekire.rf.gd/midazerumimovonolawufotu.pdfIn PDF document text
    • https://s3.amazonaws.com/rejiner/dotolad.pdfIn PDF document text
    • http://legofebufulemo.rf.gd/badminton_rules_in_gujarati.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81b90ade-f4eb-4848-8090-2e7faa97dd28/30178712978.pdfIn PDF document text
    • http://moxixezegosa.onlinewebshop.net/34936830494.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_off0000d061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD061 5740 bytes
SHA-256: 7676692e93479e5266fad278e0796c4206114b8de0441a4a0f8d8c218c45c6e2
font_01_sfnt_off0000e3f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F3 10452 bytes
SHA-256: b74dd46579dc2aa5230646727070c2201a0a3c3a92d4a590a4261587912daa03

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