Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ebb4c8a85c5bd82…

MALICIOUS

PDF

76.1 KB Created: 2021-03-18 13:22:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c3e76ee0b6103d7d488334a5a8820483 SHA-1: c331d6df37ca98f4c8cf9f900d7b6e254d1e22e8 SHA-256: 4ebb4c8a85c5bd82a46d28cd374944029528996d48a272e6051603f0fcfdfdcc
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically pointing to a link farm designed to redirect users. The PDF's structure and the presence of many external links suggest it is part of a campaign to manipulate search engine results or distribute malicious content through a network of linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gimoguvi.ru/strik?utm_term=cannery+row+novel+review PDF link annotation
    • https://cdn.sqhk.co/kulobuwaxegu/kXR0FFk/free_able_calendar_2019_canada.pdfIn PDF document text
    • http://tupaxeguna.scienceontheweb.net/basic_english_worksheets_ks3_uk.pdfIn PDF document text
    • http://zitukuwekoba.sportsontheweb.net/16526567872.pdfIn PDF document text
    • https://cdn.sqhk.co/kipaselofuza/gjij1ji/48356691973.pdfIn PDF document text
    • https://cdn.sqhk.co/puxedimuwo/icwtIhi/bogigita.pdfIn PDF document text
    • http://tenipimutav.mywebcommunity.org/januserelu.pdfIn PDF document text
    • http://dikegebe.mygamesonline.org/jumetaxisabajesojinap.pdfIn PDF document text
    • http://gazopulodagifus.iblogger.org/6737678808.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/afd36c98-5b93-4f53-afba-3bd44cb45630/resixaninufimusibe.pdfIn PDF document text
    • http://misugivunuzu.epizy.com/52985659418.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f85219a-2890-4fda-935b-2709d351e3bd/casio_wk_500.pdfIn PDF document text
    • http://dupepoge.onlinewebshop.net/23129421583.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ead75892-1c44-497c-899c-f0eb8d1a6fb9/how_do_you_cook_pork_in_a_slow_cooker_uk.pdfIn PDF document text
    • http://lanosebezazov.onlinewebshop.net/56847501420.pdfIn PDF document text
    • http://dusuwuf.rf.gd/how_to_train_your_dragon_3_movie_clips.pdfIn PDF document text
    • http://kivaxobezi.epizy.com/how_to_turn_up_mack_e7_460.pdfIn PDF document text
    • http://fepetixapokurob.myartsonline.com/bihar_tet_question_paper_2020_download.pdfIn PDF document text
    • http://mibobugaf.rf.gd/feranumax.pdfIn PDF document text
    • http://fotexamaluvim.epizy.com/chapter_6_chemistry_in_biology_chapter_test_c_answers.pdfIn PDF document text
    • http://joriboka.epizy.com/guinea_pig_fact_sheet.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_off0000ed8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8B 4660 bytes
SHA-256: c24d1fb1da26b2744d82e1efdf2f405bc9ff6357883baac67d37153e0bca1e1a
font_01_sfnt_off0000fd89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD89 11148 bytes
SHA-256: b097251abf9ecc246c18850233d1ef1cec18d3345f0b54fa440e47eed6e53992

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