Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba8245ea059f37b8…

MALICIOUS

PDF

79.4 KB Created: 2021-02-20 04:16:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 81f9ecf23227bc75139143f8d6531b19 SHA-1: e8bafd08240d6a5bb8c09642221e608aec3fa655 SHA-256: ba8245ea059f37b8fce2e1a4df0c68877ad550269651642cdcd453243d83a818
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating redirection to known malicious infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a lure to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://yafferge.ru/strik?utm_term=maytag+front+load+washer+timer+problems In PDF document text
    • https://cdn-cms.f-static.net/uploads/4446374/normal_600b4200c7d24.pdfIn PDF document text
    • http://formblckr1.xyz/medefo9qp4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500670/normal_602cdc6ae4cbd.pdfIn PDF document text
    • http://itactical.xyz/kanmani_baby_songs_in_tamil4es6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421612/normal_601e268eedc09.pdfIn PDF document text
    • https://fosovumukudire.weebly.com/uploads/1/3/4/2/134235423/b0c68f8a4a0.pdfIn PDF document text
    • http://pinipuvazus.22web.org/alcatel_one_touch_pixi_manual.pdfIn PDF document text
    • http://quickpapp.online/america_history_and_life_with_full_textayz3j.pdfIn PDF document text
    • http://sacredname.ru/how_to_get_a_link_to_the_past_on_switch0lagb.pdfIn PDF document text
    • https://tipowunukal.weebly.com/uploads/1/3/4/3/134355136/kivavik.pdfIn PDF document text
    • http://poverkavoda.website/11387919587vdee8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dojiseb.epizy.com/2012_buick_verano_performance_parts.pdfIn PDF document text
    • http://rewelopax.rf.gd/22640361197.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_off0000f807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF807 5792 bytes
SHA-256: e3b4e57ae625ddb0961e6e86a921d78dc3850b83e03d935cb16ebb354451eb20
font_01_sfnt_off00010bba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBA 10684 bytes
SHA-256: 6fc2d996dc19258567c71c578212ab1c77ced615a830825e6129a01ebd3597ec

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