Malicious PDF — malware analysis report

Static analysis result for SHA-256 515fef84f869df30…

MALICIOUS

PDF

81.4 KB Created: 2021-05-01 12:44:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 1fbddbf28e32e64ca52fd964fa9148b7 SHA-1: 59c58f2a3768caae30a150406f9f85b0da0840ca SHA-256: 515fef84f869df30da746616b227e8ef73f5b8fa638d0442b4b753bbbaa31e67
184 Risk Score

Malware Insights

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

The PDF contains 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, specifically as a phishing trojan. The document body is heavily obfuscated, but the presence of numerous links and the heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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://crophysi.ru/strik?utm_term=is+there+a+sequel+to+tell+me+three+things In PDF document text
    • https://cdn.sqhk.co/rizijuwet/jhwjbC0/nasal_cavity_definition_sa_tagalog.pdfIn PDF document text
    • https://cdn.sqhk.co/vekokizijam/bdjhijc/kuwawoseniduxulasawod.pdfIn PDF document text
    • http://instapodarok.site/benevolent_fund_kpk_loan_formqlkd4.pdfIn PDF document text
    • http://jobware.pro/64517264514adhnp.pdfIn PDF document text
    • http://vinnipoh.space/57548650609j2ajk.pdfIn PDF document text
    • https://cdn.sqhk.co/kawiwitifa/ithgwGy/baasha_tamil_film_songs.pdfIn PDF document text
    • http://sis-paypal.com/kezelozizapekix48r8.pdfIn PDF document text
    • http://xoridamewok.iblogger.org/sample_resignation_letter_template_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/pajijolabalu/iMheGgd/vovuv.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/fifuto/is_it_ok_to_rent_without_a_lease_oshkosh.pdfIn PDF document text
    • https://s3.amazonaws.com/kotodur/product_catalog_template_online.pdfIn PDF document text
    • http://lojuwuwa.rf.gd/vojidivadimuj.pdfIn PDF document text
    • http://keraxeberukin.epizy.com/kikifidoterukawevazanupon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01ef706d-25c6-4876-869e-da2f05edf8ce/jujogi.pdfIn PDF document text
    • http://rusireges.epizy.com/anatomi_cavum_oris.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7469699e-528a-43ff-a106-feb0b1eb22e6/kenmore_ultra_wash_dishwasher_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwosil/14174152063.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca6c22d2-eb34-497d-8226-8bb898532982/red_alert_3_online_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b490c531-767a-4fcd-8fa8-eaddc4a69897/dodozukexuled.pdfIn PDF document text
    • https://s3.amazonaws.com/mivokozibu/new_ethiopian_music_video_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49c5199b-ecea-4f4d-9303-e5d801b7aeaf/94112893102.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7b38f47-9cf3-4388-8065-40a819803044/do_you_use_italics_for_movie_titles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0a56dcc-d0b5-49e6-9a38-1ca48ba7e8d4/xuzojidigosume.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_off0000feb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB0 5164 bytes
SHA-256: bf10872e8e3e2a239af9cb27e61b542364887f6c9623e866c2f28c20eb05e730
font_01_sfnt_off0001100d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100D 11152 bytes
SHA-256: 143bf7b990d26248df11cb9a5a0ba0584bcf525d58583cc8d4b09481b546ba2b