Malicious PDF — malware analysis report

Static analysis result for SHA-256 7282c1d36c9aa5fa…

MALICIOUS

PDF

103.3 KB Created: 2021-03-18 12:28:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 3bda1d9e960d6c21fc1f52e9a8eff197 SHA-1: 0b2dc4c9492213c5f664bad44802bbef760de428 SHA-256: 7282c1d36c9aa5faffa0af4cd3fd5ea62c469efa7d33c579619d419e83fb9f81
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 multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. The PDF contains numerous embedded URLs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the presence of embedded URIs and the overall structure point towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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/123?utm_term=mauritania+tourist+guide PDF link annotation
    • https://cdn.sqhk.co/wapogade/hfhhxhd/bobudibidobized.pdfIn PDF document text
    • http://memowelubi.mygamesonline.org/volipijodejujiguzi.pdfIn PDF document text
    • https://cdn.sqhk.co/wadupaxi/FQia6jg/excel_macro_variable_worksheet_name.pdfIn PDF document text
    • https://cdn.sqhk.co/dasisogi/ajdhfij/weather_forecast_theme_pack_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/bupipusojok/7ggjbic/nuxisusopuravogovuzaroxa.pdfIn PDF document text
    • https://cdn.sqhk.co/zomitokemip/rhg6gc3/62708369335.pdfIn PDF document text
    • http://fekevopimibun.sportsontheweb.net/garmin_64st_review.pdfIn PDF document text
    • http://kipokefurur.mygamesonline.org/xukaluxozolisagigaderika.pdfIn PDF document text
    • http://katorewudejizut.22web.org/australian_citizenship_test_practice_questions_and_answers.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/707ffac4-4eb3-4307-8077-8dfd4b35e1f9/45730202900.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5859ba4-44d8-4771-aca9-02322c5c3836/31010625095.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0682589c-c87c-4d5a-bb88-688208b60f7d/25458934411.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6387dea3-ccc1-431e-a1c1-74b15acf6b11/the_allyn_and_bacon_guide_to_writing_brief_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c188aa09-acb5-4cfd-9e97-c4a8d12fb857/armitron_45_7012_alarm.pdfIn PDF document text
    • http://gemawinikifiv.myartsonline.com/25991897620.pdfIn PDF document text
    • http://nukalisunu.rf.gd/bubutitawatelinezas.pdfIn PDF document text
    • http://nixelotiseze.epizy.com/foxoxulofidagobibidisuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d6bcf95-ab64-45fb-8bb4-4234eaec9d50/moniciones_para_el_domingo_29_del_tiempo_ordinario_ciclo_c.pdfIn PDF document text
    • http://wasaxotudulolo.epizy.com/55095586084.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c53acad-d94c-440a-a885-8fe14812e306/52307073973.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4041d572-cbce-4bed-bb28-d3751061ca44/how_to_workout_lats_with_resistance_bands.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b46c662-62f2-4c30-a707-a9049fca3808/best_large_print_crossword_puzzle_books_for_seniors.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d75cee47-710a-4f00-8027-0a1c8bce5fa3/jbl_flip_3_turn_off_startup_sound.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8285d285-cddd-4ef2-aa45-262b3825bf11/nonadibujisibeteligud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c011fe43-747c-4b7b-b771-8b01d24961b4/24676997781.pdfIn PDF document text
    • http://kipixuge.epizy.com/mumen.pdfIn PDF document text
    • http://bopisumeku.atwebpages.com/rodivo.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000177d4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x177D4 16708 bytes
SHA-256: 05a0c9ef8d0dfff134f1d5ddc8a61e45f2b646cedc3de3606d59ee76f5657fa2
font_00_sfnt_off00013e88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E88 4964 bytes
SHA-256: 128fa83fdb36c3724e0d9cb8a970aeddd5d9e6e0059654bec116c24428dea1f7
font_01_sfnt_off00014f7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F7D 11936 bytes
SHA-256: e57305189701dbea74a0c32f3f9ef080a29e0c0a829926d34b1a5109883d2d5c

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