Malicious PDF — malware analysis report

Static analysis result for SHA-256 43dfa87373fcfc88…

MALICIOUS

PDF

82.4 KB Created: 2021-03-14 18:10:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa382b04a1bcc67d7e4f9ec159ba4b3c SHA-1: 79d9e046815748f2309d541cb68206be7051ab06 SHA-256: 43dfa87373fcfc885f100792bbdf9a789f585f9a50fffb3fc0d28ead8a4ffc35
104 Risk Score

Malware Insights

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

The file is a PDF that contains an embedded URL, identified by heuristics as a potential external URI and an embedded URL. The ML classifier and ClamAV detection strongly indicate maliciousness, specifically phishing and trojan activity. The presence of a 'download button' heuristic further supports the lure-based attack pattern. The primary IOC is the URL https://zajinet.ru/wix?keyword=nba2k17+android+apk+obb+highly+compressed, which is likely used to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wix?keyword=nba2k17+android+apk+obb+highly+compressed
    • http://imedo.ru/what_does_the_term_beautiful_disaster_meanee6t7.pdf
    • https://cdn.sqhk.co/kekelivig/heYuOHv/wixuguxewodunuba.pdf
    • https://cdn.sqhk.co/jukunobegabe/ddBiija/28764579385.pdf
    • http://sokolov.fun/crossover_behringer_cx2310_manualh02tq.pdf
    • http://airbin.top/firosafukorigavuggy9za.pdf
    • http://electorat.org/academic_writing_skills_for_phd_students5xej5.pdf
    • https://cdn.sqhk.co/tusifefovozu/elvSjf2/15811206194.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/c9830648-f5fc-43aa-a97b-9604f721c2b6/navy_diver_salary.pdf
    • https://e905e09d-7ddd-4aab-833c-73500e817873.filesusr.com/ugd/f4c08b_a4d456fa259c4811b235d4833ef9fb27.pdf?index=true
    • http://gakajitaju.atwebpages.com/15429983047.pdf
    • https://0aed7b51-d02b-4864-a6bb-b478bb809667.filesusr.com/ugd/fbdaab_4dd16afd9efe479d9082ff64fe6ab9d4.pdf?index=true
    • https://s3.amazonaws.com/fukepez/jifegazetibo.pdf
    • https://s3.amazonaws.com/gavapozalilup/what_are_the_after_hours_for_stock_market.pdf
    • https://uploads.strikinglycdn.com/files/101d822f-006d-46c1-af34-e4856939829d/multiple_intelligences_gardner_book.pdf
    • http://loxupobupibim.atwebpages.com/beliefs_of_hinduism.pdf
    • http://jeximojela.myartsonline.com/bank_guarantee_and_letter_of_credit.pdf
    • https://uploads.strikinglycdn.com/files/82b57140-4db7-4eac-a041-e3492ec70033/yamaha_rx-a820_no_sound.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f707.bin
b146a3ae647fb40d1ff13d55de26207431abbb22bd082f14efa92c7cf2ddf2b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF707 5732 bytes
font_01_sfnt_off00010a61.bin
5958ed58c12ab7ca77874534d30ad7dfbf823fcb1a7d388f9440f57ddd6f30b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A61 10600 bytes
font_02_sfnt_off00012e7a.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7A 4324 bytes

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