Malicious PDF — malware analysis report

Static analysis result for SHA-256 1505a798e1c4f52b…

MALICIOUS

PDF

74.7 KB Created: 2021-03-05 13:38:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: e15d06e40552b4a7ffffb951f2dc3025 SHA-1: aa7d89f63083efdf9e713846bee329a775c4a47c SHA-256: 1505a798e1c4f52b4259690472e3d1f61b46b3ea126044170f78744702d7600e
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged as malicious by ClamAV and an ML classifier. It contains numerous external URIs, with a high-risk heuristic indicating it's a link farm on disposable hosting. The document body, though heavily obfuscated, contains strings related to 'phonetic alphabet police usa' and the authoring application, suggesting a lure. The presence of multiple unknown reputation URLs points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/123?utm_term=phonetic+alphabet+police+usa PDF link annotation
    • http://ses-sanobrabotka.ru/pexiz4p87h.pdfIn PDF document text
    • http://nakodinita.scienceontheweb.net/classroom_management_plan_example_middle_school.pdfIn PDF document text
    • http://sudesisobibimit.22web.org/types_of_angles_definition_worksheet.pdfIn PDF document text
    • http://megalit-korolev.ru/ridoditatepoweruguwinupaopvqx.pdfIn PDF document text
    • http://devgm.design/ganipugonixijivulaz15mpf.pdfIn PDF document text
    • http://itgermany.net/why_does_my_baby_rub_my_breast_while_nursingagpb9.pdfIn PDF document text
    • http://wavolat.iblogger.org/sijapeduvoz.pdfIn PDF document text
    • http://wodunobogigav.22web.org/data_visualization_tool_reporting.pdfIn PDF document text
    • http://fumizudo.sportsontheweb.net/how_to_use_all_american_pressure_cooker.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/319bd0fe-32fc-4774-8c5e-2f79ed4f75e2/rupujokibisu.pdfIn PDF document text
    • http://golujaxi.epizy.com/rakej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27477ce8-19f8-4772-a37d-f06423fd4389/successful_coaching_4th_edition_chapter_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81c3ed78-8e53-4421-bd68-659a6e4abed4/bugavoteb.pdfIn PDF document text
    • http://xofunuxemijowex.rf.gd/jibinedejikujeseti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32415ced-6002-4934-8a6c-bbfebf9a8bdb/pride_and_prejudice_characters_zodiac_signs.pdfIn PDF document text
    • http://dumixagaw.rf.gd/how_to_use_fanboys_in_a_sentence_examples.pdfIn PDF document text
    • http://fedonefekipide.myartsonline.com/logical_reasoning_math_questions_and_answers.pdfIn PDF document text
    • http://wipapirub.epizy.com/arabic_numbers_1_to_100.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7a2aff5-f438-4b68-95b7-d0031ba1ca8d/46976285721.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1464abc-1a0d-47fa-90a9-b6de31dc6e29/how_to_fix_singer_tradition_sewing_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfcd9bc4-f5b0-4d44-a0b0-256690642676/words_their_way_spelling_inventory_worksheet.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_off0000e8f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F4 5064 bytes
SHA-256: 4be414f4df4e0358e113a565a76936c744808dee0880f01fe8033e2459b72a46
font_01_sfnt_off0000fa27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA27 10392 bytes
SHA-256: a7699d16ff1a0806a83f5dd23b3b17daa9ca7c3618fe7b67c7c9e754f51ce41f

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