Malicious PDF — malware analysis report

Static analysis result for SHA-256 37afbd5efdc25f0f…

MALICIOUS

PDF

67.4 KB Created: 2021-02-18 22:05:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: a366e8d0d4a8a46987f4be855708a330 SHA-1: 2de5de5044fcf24a42cca51724bfb9fb2000a256 SHA-256: 37afbd5efdc25f0fb2a2ce83152ded651267f832a57cbda0ba181e654c81240c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL (https://maypoin.ru/strik?utm_term=wr30m+watch+turn+off+alarm) flagged as suspicious and likely malicious. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan PDF. The presence of many links on disposable hosting further supports a malicious campaign, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/strik?utm_term=wr30m+watch+turn+off+alarm PDF link annotation
    • http://webdefilmizle.com/creating_letterhead_template_in_word35fgw.pdfIn PDF document text
    • http://best-store.club/warcraft_3_portable_fullcfh3a.pdfIn PDF document text
    • http://prolac.ru/redekazinuxexapeit4yv.pdfIn PDF document text
    • http://tobepotalesozaj.22web.org/bajaj_finance_fd_application_form.pdfIn PDF document text
    • http://zahlungsservice-ch.site/529764792914aqan.pdfIn PDF document text
    • http://tosety.xyz/biology_book_ib3t272.pdfIn PDF document text
    • http://italia-doc.space/blending_words_worksheetss32ep.pdfIn PDF document text
    • http://instapriz365.site/xitaberaneranipulakij45lui.pdfIn PDF document text
    • http://copyrighytsupport.com/packers_uniform_schedule_2018szysf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tanazutoja.rf.gd/gluon_scene_builder_templates.pdfIn PDF document text
    • http://rerodijunenema.epizy.com/kindergarten_color_names_worksheets.pdfIn PDF document text
    • http://lorojol.rf.gd/79872122933.pdfIn PDF document text
    • http://lepetape.epizy.com/17441033631.pdfIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/shakespeare_sonnet_29_explanation.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/argosy_university_atlanta_transcript_request_form.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_off0000c5cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5CB 5356 bytes
SHA-256: dd1c41031efe6e158271f9443f8fcc1d388c87c3771ae29ef1e05863ab68e0ad
font_01_sfnt_off0000d7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F3 12572 bytes
SHA-256: f9abe8e3db8705bad81e185cfa1dd49fbc20c023f4c1d9b82417dcf6e377c7f0

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