Malicious PDF — malware analysis report

Static analysis result for SHA-256 70ff21e28ddacf34…

MALICIOUS

PDF

76.1 KB Created: 2021-03-19 22:08:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 310decaf415e8b7346194f56a06c7a4f SHA-1: c69a03ff616d37e3e30e2416ea17c0e0793aec9d SHA-256: 70ff21e28ddacf347b26c7850fa54df8c00472d62ecdd420149af4527e04ef02
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF containing embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV also flagged this file as malicious. The document body, though heavily obfuscated, appears to be a lure related to 'Catcher in the Rye study guide questions'. The primary IOC is the malicious redirector URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=catcher+in+the+rye+study+guide+questions+chapter+1 In PDF document text
    • http://mazers.fun/samsung_dmt400rhs_error_codesgmyxe.pdfIn PDF document text
    • http://rostov-mobile-doctor.ru/active_passive_transport_worksheet_answersdbaix.pdfIn PDF document text
    • http://gnoogle.site/the_red_pyramid_chapter_7_summary2ndc3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377663/normal_60285a6ddf1a0.pdfIn PDF document text
    • http://tekplafond.xyz/audacity_download_mac_10.7_5kne7i.pdfIn PDF document text
    • http://pixxel.life/kudilakokoxejopif9gd5a.pdfIn PDF document text
    • http://reduslim-sito.site/contrato_de_arrendamiento_apartamento_formato52lw9.pdfIn PDF document text
    • http://seamanygau.best/42545805925cuq18.pdfIn PDF document text
    • http://qrastenmap.online/dubuvokizewepaxadibidoby2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447098/normal_5fca278882ef9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9d349da1-218b-4b59-9e37-2a90cab56d40.filesusr.com/ugd/de9003_afafec10f57f439ebda5587be6ce4c13.pdf?index=trueIn PDF document text
    • https://9afb1793-bc57-4514-bb46-74e980466609.filesusr.com/ugd/11f207_f1e11dea64c44644a65c509bb6d4970f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f65c743e-d8a2-41f8-8ff2-93b6cdc0b5fb/how_to_use_turtle_beach_x12_on_xbox_one.pdfIn PDF document text
    • http://xonifovozub.epizy.com/english_to_german_translator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/972671a0-beee-44d3-9d12-885a8cc981a7/15431675995.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ba9c7ca-5097-451c-9a3f-a2829860142c/equal_protection_of_the_law_legal_meaning.pdfIn PDF document text
    • https://44dd6259-7513-41c7-b2f1-b2b1fc385d2e.filesusr.com/ugd/63022f_1f07c6f66ca74686a64121f831f2cb4e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6264a463-9b6f-4b2b-8562-590a05cc2165/how_much_should_a_furnace_cleaning_cost.pdfIn PDF document text
    • http://kevefadewa.epizy.com/une_soeur_bastien_vives_gratuit.pdfIn PDF document text
    • https://6f12065f-c45d-410c-b048-6ec23fb2b810.filesusr.com/ugd/02ccf7_107b6a6e00384068be9984e4276910ab.pdf?index=trueIn PDF document text
    • http://wugepigen.epizy.com/pictograph_worksheets_for_grade_2.pdfIn PDF document text
    • http://ladinuronabo.epizy.com/how_to_know_redox_reactions.pdfIn PDF document text
    • http://doroxepazu.epizy.com/97147971246.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab6d273f-9da5-4bf6-975a-ea67ffdd1818/8657859171.pdfIn PDF document text
    • https://1e1f235d-56dd-4976-b20d-d38e3fe7b172.filesusr.com/ugd/210b45_1f951c6f30c1417eb24ef2309818b59f.pdf?index=trueIn 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_off0000e899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE899 5488 bytes
SHA-256: fb4a04c7e19fa91404b211adeb290dfd0e9e4fbe47f1cbda984ce684a40fcd0c
font_01_sfnt_off0000fb41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB41 11068 bytes
SHA-256: 43114682d5dabc8a0bb8c829b59f43ddf0be4193c60bbdf5a05238dd6fc68e4e

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