Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a7d8189b431f18d…

MALICIOUS

PDF

60.9 KB Created: 2021-01-15 08:24:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: f53dadb0bdcdda15fcab1807c3a170f4 SHA-1: 7581d50a66a83fddc9fd1a846e490e5421b46c13 SHA-256: 5a7d8189b431f18d8e39a84d626570288adce7a87ef16b305024b0686488696c
154 Risk Score

Malware Insights

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

The sample is identified as malicious by multiple heuristics, including a critical alert for a PDF redirector link to known malicious infrastructure. The ML classifier also strongly flagged the PDF. The primary IOC is the malicious URL embedded within the document, which is designed to redirect the user to further malicious content. No scripts were extracted, but the presence of a malicious redirector strongly suggests a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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://gettraff.ru/123?utm_term=onicon+f-3100+price In PDF document text
    • https://site-1173855.mozfiles.com/files/1173855/teacher_simulator_game_online.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425238/normal_5fc7c959e5b2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482638/normal_5fa9666daa405.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492593/normal_5fde8c638005e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374021/normal_60004601105d9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456663/normal_5fe2845227210.pdfIn PDF document text
    • https://site-1177548.mozfiles.com/files/1177548/xugozazosiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418570/normal_5f9f1d6e008b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450336/normal_5fdbdc908a8d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408599/normal_5fd11e52cbc52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375705/normal_5f899e4080df3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lijopavexanuse/manual_agisoft_metashape_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/battle_ropes_proper_form.pdfIn PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/bengali_video_song_free.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_off0000b365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB365 5008 bytes
SHA-256: cd273fee4e2b4f56d04a216743078fd1fa6db5a2951bbd5d479788865c45007c
font_01_sfnt_off0000c498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC498 10228 bytes
SHA-256: 22779fb55dbd952971740d27b4ad891ff9a1a321164b897bf511c168fd3896c8

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