Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d3946883294a49c…

MALICIOUS

PDF

66.5 KB Created: 2021-03-03 16:33:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 51a329b13908d569fa06739dd3ea124a SHA-1: 4788b3ce43c61f70a0a49132fb67440a8b678477 SHA-256: 0d3946883294a49c8b7ca65d820bf8795545708e630b4b65fb4376bd5b5d9dad
134 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links to disposable domains, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic and a high ML classifier score further support malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing lure, likely leading to a second-stage download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pelibifir.ru/award?keyword=thinkpad+t420s+windows+10+drivers PDF link annotation
    • http://lenugaguv.medianewsonline.com/bamobitenu.pdfIn PDF document text
    • http://chisto-chisto52.ru/python_iterate_through_string_backwardswp5r1.pdfIn PDF document text
    • https://bexusisase.weebly.com/uploads/1/3/4/5/134596812/c65f527.pdfIn PDF document text
    • https://wasatetokis.weebly.com/uploads/1/3/4/5/134513062/9e65162add5561c.pdfIn PDF document text
    • http://fallofelin.online/how_are_you_today_interview_answersfm966.pdfIn PDF document text
    • http://viwiwasuzozu.22web.org/2010_chevy_malibu_issues.pdfIn PDF document text
    • http://gapilojazixo.getenjoyment.net/how_he_loves_us_kim_walker_free_mp3_download.pdfIn PDF document text
    • http://rakadan.sportsontheweb.net/tuvivizasedabusax.pdfIn PDF document text
    • http://cesaregaspari.com/destiny_s_child_members_originaliz3x1.pdfIn PDF document text
    • https://faromemexe.weebly.com/uploads/1/3/5/3/135399009/f4b52e5c.pdfIn PDF document text
    • http://italystore.pro/the_elementalists_choices_chapter_11_answerst6t8m.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ketanuviz.epizy.com/creature_movie_ka_all_song.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/la_isla_bonita_alizee_mp4.pdfIn PDF document text
    • http://webimonok.epizy.com/61021835274.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_off0000c850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC850 5592 bytes
SHA-256: 6414062bb74decdb8039d3627156a46de3cb01f2549f78ec0bfcf11500f2640e
font_01_sfnt_off0000db6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6C 9828 bytes
SHA-256: 1eed835ad1a468ee504f64b39415d76d5a43e78d50a0bc4b8df85ea930b8aeff

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