Malicious PDF — malware analysis report

Static analysis result for SHA-256 0eb1e4fa3c53ea57…

MALICIOUS

PDF

70.2 KB Created: 2020-12-24 01:16:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 561bdfb52b1970391500a042be5bf40e SHA-1: e00b9e003cecaa18cf4c1290c4ca60cb8c47e6c9 SHA-256: 0eb1e4fa3c53ea57b53d85fd1e66d0fc71c38c8fbc6a40a3fd6247fa0c0c079c
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, and it contains a high number of external links. One critical heuristic indicates it's a PDF redirector link pointing to a known malicious domain. The document body is heavily obfuscated, but the presence of numerous links suggests a phishing or SEO spamming campaign. No scripts were extracted, but the nature of the links implies an attempt to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://traffmen.ru/aws?utm_term=bone+callus+formation+foot In PDF document text
    • https://cdn.sqhk.co/xobitabab/gdiaRjb/lg_smart_diagnosis_app_for_refrigerator.pdfIn PDF document text
    • https://cdn.sqhk.co/kapidibewomu/7Cdib7H/89146433717.pdfIn PDF document text
    • https://cdn.sqhk.co/ratijojitud/rjbaij8/nolixurawiwumirewumuwoj.pdfIn PDF document text
    • https://tipiridevozono.weebly.com/uploads/1/3/4/3/134349557/90250.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/923f00dc-94d9-4f79-a2bd-18207752503e/tutunemapabujirixunid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a94b5f37-aa7d-426c-8e00-748c3718beb0/south_carlsbad_sb_campsite_photos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29de44c3-1618-44f9-b42c-633c4d6d4ba5/portadas_para_trabajos_universitarios_word.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8166ccb0-d057-4330-80cb-2da3eab0d01d/rilasomepejawotubutajid.pdfIn PDF document text
    • https://s3.amazonaws.com/pipaneku/11472929111.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04b0d898-1033-4ce2-9e0e-42a7a1d716b9/mountain_monsters_season_6_episode_6_watch_online_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/bastar_university_supply_exam_form_2018.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_off0000d5c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C7 5076 bytes
SHA-256: a7b40230ed2e360804a9e22501f1d7aaf8d726f2488cb97081aacddba8dc067f
font_01_sfnt_off0000e6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F4 10932 bytes
SHA-256: 902dfb1a5d775d21282ded5663db08cc4d4f5f00ecd3be7d2a111753f169133a

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