Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3c6360472a53eb9…

MALICIOUS

PDF

67.2 KB Created: 2021-01-10 00:36:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 74523e4023f84d99a7feda25b240ac63 SHA-1: 2ca79be7e2268c847d7fd9a9e1f26f3c3505e287 SHA-256: e3c6360472a53eb9a56a25f1a0948ce1676c55f3ff8695398fd505448c416060
192 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The embedded URLs and the ML classifier output strongly suggest a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the nature of the embedded links and the PDF structure indicate it's designed to lead the user to a harmful destination.

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
  • 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 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
  • 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://cctraff.ru/aws?utm_term=1st+year+engineering+graphics+pdf In PDF document text
    • https://madajeguruxe.weebly.com/uploads/1/3/4/3/134348767/revurepawogorakefi.pdfIn PDF document text
    • https://site-1173807.mozfiles.com/files/1173807/alien_warfare_wikipedia.pdfIn PDF document text
    • https://jimivisimobud.weebly.com/uploads/1/3/4/9/134901817/novaruvolorebiniku.pdfIn PDF document text
    • https://site-1166752.mozfiles.com/files/1166752/electromagnetic_fields_textbook.pdfIn PDF document text
    • https://site-1178226.mozfiles.com/files/1178226/fikupawirurunemigagakifuk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477886/normal_5ff0f4c16dee5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500438/normal_5fc7a91cb26a7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498994/normal_5ffa2e595ceac.pdfIn PDF document text
    • https://site-1168131.mozfiles.com/files/1168131/tisikefu.pdfIn PDF document text
    • https://site-1168140.mozfiles.com/files/1168140/kakudegoko.pdfIn PDF document text
    • https://site-1168300.mozfiles.com/files/1168300/space_simulator_online_game.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368500/normal_5fb38cbb99faa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402519/normal_5fea22d088837.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393183/normal_5fab285b36665.pdfIn PDF document text
    • https://site-1171695.mozfiles.com/files/1171695/galaxy_space_shooter_apk.pdfIn PDF document text
    • https://site-1166618.mozfiles.com/files/1166618/android_10_for_moto_one_power.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c9e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E6 5444 bytes
SHA-256: 3959e6152fcb9e54f6522d511e15a3bed97efc470ed92e824381991c51490d95
font_01_sfnt_off0000dc72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC72 10240 bytes
SHA-256: 731a40fb68ac8029b383efdd44f6764f1e304e3afc2c671517444288080298e2

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