Malicious PDF — malware analysis report

Static analysis result for SHA-256 e739174a1debd26e…

MALICIOUS

PDF

78.5 KB Created: 2021-03-31 03:44:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: cc7b5920b8607c09a76fc383aca91635 SHA-1: 7d096d009f89b999771a3258d46fbf6a94301cdd SHA-256: e739174a1debd26eb4b7fd3e4a7f51bc808cf94e4508d8f641a441af11241eb2
244 Risk Score

Malware Insights

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

The sample was identified as malicious by multiple heuristics, including PDF_MALICIOUS_REDIRECTOR_LINK and ML_NYX_PDF_MALICIOUS, and ClamAV detection. It contains a large number of embedded URLs, many pointing to disposable domains and potentially malicious redirectors, suggesting a phishing or SEO spam campaign. No scripts were extracted, but the presence of numerous links indicates an attempt to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/award?keyword=awg+to+mm2+conversion+chart+pdf In PDF document text
    • https://cdn.sqhk.co/pofaxiniraz/eieY3jb/widekoduxozowan.pdfIn PDF document text
    • https://cdn.sqhk.co/jarixizotib/iiiaoij/race_calendar_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/wofikubid/jpNhahh/russian_drag_racing_championship.pdfIn PDF document text
    • https://cdn.sqhk.co/vozupowo/jeLjeJA/car_payment_calculator_with_tax.pdfIn PDF document text
    • http://fegekeketed.22web.org/80436723997.pdfIn PDF document text
    • https://zutomufafet.weebly.com/uploads/1/3/1/6/131607254/vagefuba.pdfIn PDF document text
    • http://viteroludobano.mypressonline.com/hakikat_pendidikan_islam.pdfIn PDF document text
    • https://zupawifotifawe.weebly.com/uploads/1/3/4/4/134480263/gepabasoso-derivaxovo.pdfIn PDF document text
    • http://pepopaguwanutet.22web.org/weekly_planner_with_time_slots_template.pdfIn PDF document text
    • https://siwelizotelet.weebly.com/uploads/1/3/1/4/131437983/7cb98cbc7ec11.pdfIn PDF document text
    • https://cdn.sqhk.co/woledibiroju/iic6sgc/subway_franchises_for_sale.pdfIn PDF document text
    • https://xudinenudomojuv.weebly.com/uploads/1/3/4/3/134356320/zezoguwidexone.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fejonaxi.myartsonline.com/zavipo.pdfIn PDF document text
    • http://wikugojumoxo.epizy.com/2006_pontiac_g6_service_manual_free_download.pdfIn PDF document text
    • http://kesolimasakifi.myartsonline.com/assamese_song_lyrics.pdfIn PDF document text
    • http://nevafofuvabovid.atwebpages.com/wujegoz.pdfIn PDF document text
    • https://s3.amazonaws.com/titugome/bimufafuvirirusorof.pdfIn PDF document text
    • http://rozepof.rf.gd/72277189688.pdfIn PDF document text
    • http://nejimafalun.onlinewebshop.net/12412893198.pdfIn PDF document text
    • https://s3.amazonaws.com/tezude/work_permit_application_form_europe.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/tavadumowirimujome.pdfIn PDF document text
    • http://fesemuk.rf.gd/99386745074.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_off0000f191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF191 5808 bytes
SHA-256: bc96a1c1fc4adc54d5599a8e75ba7eac4a5d631c3df4e6bfe44f825e774d7358
font_01_sfnt_off00010558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10558 11868 bytes
SHA-256: fd70a04f2319db77b64a741fbe1f4436c3b1e75116c55516672af95f5263cf74