Malicious PDF — malware analysis report

Static analysis result for SHA-256 0515594a71492ae9…

MALICIOUS

PDF

71.0 KB Created: 2021-02-17 00:19:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: a2e56ba9e4d8fc7922512e590451ea24 SHA-1: ef86e1510f1d0e4ba6251b4ce9a483ec9249df6a SHA-256: 0515594a71492ae96b4be94c939702968fd87b032f437e938b40a1cdc400a2c0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The PDF contains multiple external URIs and a heuristic firing for a 'download button' lure, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the presence of numerous links, including one pointing to 'jacksth.ru', suggests the document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://jacksth.ru/strik?utm_term=does+burger+king+have+specials PDF link annotation
    • https://mirinojasuri.weebly.com/uploads/1/3/4/5/134588432/2191569.pdfIn PDF document text
    • http://stakingyfi.com/delete_text_in_acrobat_pro_9j59pf.pdfIn PDF document text
    • http://baranaydin.org/service_engine_soon_reset_infinitid1863.pdfIn PDF document text
    • http://uscarinsurance.info/listening_test_4_book_10_answersuvt8f.pdfIn PDF document text
    • https://besukobar.weebly.com/uploads/1/3/1/0/131069863/7774202.pdfIn PDF document text
    • http://butukuwekutej.iblogger.org/tijinakemaratuxasozid.pdfIn PDF document text
    • http://gadalunapolad.22web.org/10_commandments_of_georgia_guidestones.pdfIn PDF document text
    • http://onsideball.info/84398748381ov2i3.pdfIn PDF document text
    • https://cdn.sqhk.co/sijoputolu/RZkoTBW/free_livestream_software_for_mac.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nenumezamotimi.epizy.com/dysarthria_treatment_worksheets.pdfIn PDF document text
    • http://lunagugodojeb.epizy.com/jurassic_park_theme_song_trumpet_sheet_music.pdfIn PDF document text
    • http://jagofebasej.epizy.com/atelier_lulua_switch_performance.pdfIn PDF document text
    • http://mebewoxesare.epizy.com/segment_wise_balance_sheet_of_nestle.pdfIn PDF document text
    • http://tobesonev.rf.gd/85346398819.pdfIn PDF document text
    • http://sijelufuzarolup.epizy.com/navodaya_application_form_2019-_20.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_off0000d4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BC 5456 bytes
SHA-256: a73d9bac03c5a4273bf85261c4f31f6a0a0ea231718b80dc6ab1a8d2f0a07a91
font_01_sfnt_off0000e754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE754 11184 bytes
SHA-256: d58f767252827f4bc7ad078758bf608e2524c5bd5312e728c605e217d8e29e20

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