Malicious PDF — malware analysis report

Static analysis result for SHA-256 07bcbdf9c8902177…

MALICIOUS

PDF

86.2 KB Created: 2021-02-14 17:01:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8ff7366e7853ce15f87b77628a130cf1 SHA-1: dbbec929147a997489222d2958eb5fa003c29797 SHA-256: 07bcbdf9c8902177da965a795848445b94889a4e16a9050fd29e55662999e022
126 Risk Score

Malware Insights

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

The PDF document contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious websites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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://bologen.ru/wix?keyword=geometry+chapter+3+quiz+2+answers PDF link annotation
    • https://jojapewabivato.weebly.com/uploads/1/3/1/3/131379205/535bc871c89.pdfIn PDF document text
    • http://jeruxawi.iblogger.org/bixotovipoki.pdfIn PDF document text
    • https://kerawidirara.weebly.com/uploads/1/3/4/7/134746453/7374886.pdfIn PDF document text
    • https://mejodedasebedo.weebly.com/uploads/1/3/4/7/134725949/7868902.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367275/normal_5fccd19993e0b.pdfIn PDF document text
    • http://xalukofokunes.iblogger.org/zosaroputuvefi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383475/normal_601377fdd72f6.pdfIn PDF document text
    • https://rapelolizoxofi.weebly.com/uploads/1/3/1/3/131381924/sowufanixapo_sejanozujigo.pdfIn PDF document text
    • http://julaximufe.66ghz.com/level_76_escape_room_answer.pdfIn PDF document text
    • https://vedatirujoxe.weebly.com/uploads/1/3/1/6/131606280/6358833.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477916/normal_5fd8bae4a64bb.pdfIn PDF document text
    • http://tukudetu.iblogger.org/android_language_settings_chinese_to_english.pdfIn PDF document text
    • https://jizetexosobuwek.weebly.com/uploads/1/3/0/7/130740437/987b489.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472760/normal_5fdff8ed7a33c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wovutemikinodow.rf.gd/birds_of_paradise_font_free.pdfIn PDF document text
    • http://xisapedugifado.epizy.com/bepozividumukipodavolozef.pdfIn PDF document text
    • http://fubatasofofezo.rf.gd/old_carolina_menu_nutritional_information.pdfIn PDF document text
    • http://nalakakowim.epizy.com/19907078888.pdfIn PDF document text
    • http://gunubepixel.epizy.com/59557595707.pdfIn PDF document text
    • http://tuvufuxo.epizy.com/catholic_faith_formation_at_home.pdfIn PDF document text
    • http://xedonufil.rf.gd/shiva_cartoon_ki_photo.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_off00011003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11003 5836 bytes
SHA-256: 9819f683ca3aaa568a6e81915decc44cba660754e1e633f0d01e5cd7abe809b0
font_01_sfnt_off000123e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E5 11484 bytes
SHA-256: a3ca19ef951b2b032cdf25a938a5b26f6cfab944a128122dccde54f0e6237428

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