Malicious PDF — malware analysis report

Static analysis result for SHA-256 5762a34ea652c393…

MALICIOUS

PDF

82.7 KB Created: 2021-03-21 09:56:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 3c3f6e98d93a485598cb988fa385da00 SHA-1: dbfb68f56a8e294a84e22d67c37ed33ae2fc5b63 SHA-256: 5762a34ea652c393a3b85ab474aa5600742b0cf0cabef294c7a4a236e8be8625
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 flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains multiple embedded URLs, with at least one, 'https://jumiwimov.ru/wix?keyword=ti+nspire+cx+statistics+guide', appearing to be part of a link farm designed to redirect users to potentially malicious content. The document body, though heavily obfuscated, suggests a lure related to 'Ti nspire cx statistics guide', indicating a potential phishing or social engineering attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jumiwimov.ru/wix?keyword=ti+nspire+cx+statistics+guide PDF link annotation
    • http://rajajime.mypressonline.com/funutovu.pdfIn PDF document text
    • https://cdn.sqhk.co/guzoladip/ujdibha/zinef.pdfIn PDF document text
    • http://begimewabifax.getenjoyment.net/ruvefozinakedojuninavuru.pdfIn PDF document text
    • http://kujinatazema.sportsontheweb.net/application_letter_for_a_job_example.pdfIn PDF document text
    • http://gosepakaf.getenjoyment.net/18808296541.pdfIn PDF document text
    • https://cdn.sqhk.co/sisadenev/S4Ah9ij/download_game_cheat_death_invasion_survival.pdfIn PDF document text
    • http://duwinijuj.mypressonline.com/how_many_times_can_you_day_trade_crypto_on_robinhood.pdfIn PDF document text
    • https://cdn.sqhk.co/xapanularopu/CT5hdDx/hotel_courtesy_call_template.pdfIn PDF document text
    • http://tujidal.mypressonline.com/20698354792.pdfIn PDF document text
    • http://leseweremizew.scienceontheweb.net/chopin_prelude_6_analysis.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/8c9a46a5-8d72-4b4b-9235-3949549c4820/multiplication_and_division_basic_facts_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/polojuliragam/black_sheep_affair_full_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/dazuxujepov/58974524420.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44432e8d-9e85-4783-beef-54e52a45365e/kiwan.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/the_best_synonyms_in_french.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45403996-a573-4729-873b-b41ea34bb821/simplifying_expressions_worksheet_kuta.pdfIn PDF document text
    • http://sutexuvidag.myartsonline.com/c_function_reference_pointer.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000deec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEC 5228 bytes
SHA-256: 15b5b27a94233ef895fb61e494754efdc886d8854ebe4ad5204042eb90d2808d
font_01_sfnt_off0000f0bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BF 2236 bytes
SHA-256: 6a84a037b4f385259c0074003cd9883289ed216360179eaddebdb4d5f276e5ed
font_02_sfnt_off0000fa83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA83 12644 bytes
SHA-256: 797d273383f36376384de6f59fa786f6bd8c1fdeb644bc4c9c98473fb4832297
font_03_sfnt_off0001252e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1252E 16404 bytes
SHA-256: 2e2dfded840fb0da142dd8e328055f69e0f9255dc29da905f80b65a85b005f85

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