Malicious PDF — malware analysis report

Static analysis result for SHA-256 8458cfd779e5e6ca…

MALICIOUS

PDF

87.4 KB Created: 2021-04-17 18:04:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 6d19f230dbe23a94adc548b92e584b60 SHA-1: e2dc313f23e2ff1e722eb2695f4e8cbf47e55e21 SHA-256: 8458cfd779e5e6ca61b679fd13140fd4869e4a3db3dad65557dc29abb4bd6937
96 Risk Score

Malware Insights

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

The PDF file contains embedded URLs, one of which is disguised as a game guide to entice clicks. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristic firings suggest a common pattern for malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=mass+effect+andromeda+guide+pdf PDF link annotation
    • http://lutonetofon.iblogger.org/aitsl_standards_for_principals.pdfIn PDF document text
    • http://nunejabu.scienceontheweb.net/kujorakepumiloga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470399/normal_5fd68ca374250.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487647/normal_6052b1af7aa4d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464730/normal_5fe2e13e24672.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481520/normal_605bb520b39cf.pdfIn PDF document text
    • http://kubamawowu.22web.org/4_qul_with_urdu_translation.pdfIn PDF document text
    • http://deladinabixek.sportsontheweb.net/canard_pc_hardware_37_download.pdfIn PDF document text
    • http://numidib.22web.org/bridal_bingo_template.pdfIn PDF document text
    • http://niwadeg.mywebcommunity.org/atp_synthase_in_mitochondria.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xupovobejanam/gmat_reading_comprehension_articles.pdfIn PDF document text
    • https://s3.amazonaws.com/gedexim/sufitijitopoxi.pdfIn PDF document text
    • http://fabedidatifi.onlinewebshop.net/ascii_conversion_chart_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ff1f7b4-296b-40cb-b66a-af89883a73d5/52724613344.pdfIn PDF document text
    • https://s3.amazonaws.com/megelugik/messenger_video_call_for_windows_phone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/758e4a6a-32a2-4e21-b622-192828e7cd59/94243921206.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/ielts_listening_test_samples_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/chhota_bheem_stories_video_free.pdfIn PDF document text
    • http://dalefiza.rf.gd/4635989651.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/203b3bbd-4281-4142-9b68-45feff2a5fe2/what_do_you_mean_by_magna_carta_for_small_enterprises.pdfIn PDF document text
    • http://zuzipidagazetu.rf.gd/elgar_cello_concerto_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/free_vevo_app_for_android.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_off00011807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11807 5448 bytes
SHA-256: 73106276356d6f856c947a7a148e09b295d3dd7c949903f29ee05c3511592452
font_01_sfnt_off00012a88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A88 11212 bytes
SHA-256: abe4f2923d850a33d056134f4ea68559c8a91245ec841372285691e825ecb527

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