Malicious PDF — malware analysis report

Static analysis result for SHA-256 a51eddfe9cbdeb50…

MALICIOUS

PDF

76.5 KB Created: 2021-02-22 07:42:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: a2982051d266b9d64561d27d9b8a4124 SHA-1: dc4c58b37f9e5f042183511ad6fbe078ce12f438 SHA-256: a51eddfe9cbdeb50dfab60d1b6d31b5f155a367775c3f9ed24ce8df2bbd221ec
124 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with several pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9761

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://jottigo.ru/strik?utm_term=the+standard+enthalpy+change+of+formation+of+ethanol PDF link annotation
    • https://cdn.sqhk.co/koxuvusu/mc2gfib/99565102886.pdfIn PDF document text
    • https://widafesisitix.weebly.com/uploads/1/3/5/3/135321065/43df190043.pdfIn PDF document text
    • http://bomezifubaf.iblogger.org/ask_and_it_is_given_scripture.pdfIn PDF document text
    • http://xekepova.iblogger.org/67767411753.pdfIn PDF document text
    • https://cdn.sqhk.co/pixorikibam/hgCigjj/sufogajitodokotaser.pdfIn PDF document text
    • https://cdn.sqhk.co/joxufejod/hieCibs/simcity_buildit_hack_tool_download.pdfIn PDF document text
    • https://cdn.sqhk.co/mijajijem/iiPyEJT/iphone_x_ringtone_free_download_high_quality.pdfIn PDF document text
    • https://cdn.sqhk.co/zidenesek/RKGLiid/big_boy_cartoon_images.pdfIn PDF document text
    • https://cdn.sqhk.co/fatidizeru/hhLTtCt/earthquake_map_san_andreas_fault.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://naxosavor.rf.gd/47263121199.pdfIn PDF document text
    • http://robinovedibepo.epizy.com/crafting_and_building_apk_android_oyun_club.pdfIn PDF document text
    • https://s3.amazonaws.com/wuxupewu/kobew.pdfIn PDF document text
    • https://s3.amazonaws.com/gawabog/85766833137.pdfIn PDF document text
    • http://fipotunisobojow.epizy.com/pexixux.pdfIn PDF document text
    • http://womutefipile.epizy.com/latest_windows_10_pro_iso.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/tujujo.pdfIn PDF document text
    • https://s3.amazonaws.com/pekatikisuruki/filmywap_2018_bollywood_movies_kabir_singh.pdfIn PDF document text
    • http://moborudazijom.epizy.com/australia_visa_application_form_sample.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F2 5620 bytes
SHA-256: d09802bfde308b82d7fb41110ed3959b9b2c64760968d796fe980bb5837617d1