Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5183eb136ae4aba…

MALICIOUS

PDF

73.8 KB Created: 2021-03-24 01:29:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: fe0a8eaa9e8afe7dd686ed1257c5c017 SHA-1: 7340533b7cbd64d0df422040d076eb9f9c3c215d SHA-256: f5183eb136ae4aba5519cf65395a12a76947b46fa8a47e08f6eee4ebc0dbb1bf
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Numerous external URIs were embedded within the document, with many pointing to disposable hosting domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of this document being used to distribute malware or conduct phishing attacks by directing users to a large number of potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://dugedepap.ru/123?utm_term=control+chart+template+asq PDF link annotation
    • http://usesucre.pro/mirewumovagumutejs3f1a.pdfIn PDF document text
    • https://cdn.sqhk.co/kutupejotige/ehcieji/nizumumiso.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468537/normal_5feafbcb074e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408330/normal_6012240eb0d55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405179/normal_6032d6c04ef86.pdfIn PDF document text
    • http://gonzo-3d.com/how_do_i_download_brushes_for_procreate_pocket2renk.pdfIn PDF document text
    • http://vorecan.space/bingo_and_rolly_clean_up_songubm9n.pdfIn PDF document text
    • http://jopalebifu.iblogger.org/40585400825.pdfIn PDF document text
    • http://g2am2e.xyz/tutorial_sign_up_form8ip2j.pdfIn PDF document text
    • https://cdn.sqhk.co/tazifawixax/iahgibb/91736901804.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449616/normal_601c025f2f706.pdfIn PDF document text
    • http://pumutug.iblogger.org/anopheles_subpictus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413712/normal_605a75d5646ed.pdfIn PDF document text
    • https://cdn.sqhk.co/vesagivara/cvudbWn/microsoft_sharepoint_designer_2010_64_bits_espanol.pdfIn PDF document text
    • http://nuwiratuzitezep.22web.org/meade_telescope_service.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://juropap.rf.gd/java_jdk_7_for_windows.pdfIn PDF document text
    • http://lifapalifarivug.rf.gd/22486157653.pdfIn PDF document text
    • http://bibuxidon.rf.gd/13419121510.pdfIn PDF document text
    • http://zunaxixe.rf.gd/whirlpool_dishwasher_wdf520padm3_troubleshooting.pdfIn PDF document text
    • http://bawatusarab.epizy.com/sindrome_de_cansancio_cronico.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_off0000e393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE393 5204 bytes
SHA-256: 7bf7cdded1bf5b91f490eb5a511510a4fb1ea60158728c6bf8c7a34b0792bf23
font_01_sfnt_off0000f513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF513 10872 bytes
SHA-256: 1d741c58572241f795414e0219d9280655a63edaf9cd7e9bf9f8938b17881aec

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