Malicious PDF — malware analysis report

Static analysis result for SHA-256 61b9472f70bd9d2b…

MALICIOUS

PDF

69.2 KB Created: 2020-11-25 03:41:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 3edc39bea7b13fbeed5aacae05ac73ea SHA-1: 98720bd4e9c0c20e7e0bd087dd71046932540672 SHA-256: 61b9472f70bd9d2bc6392ec549fd2f221a261cab32b841d6b479c1c446e32a62
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links pointing to known malicious redirector infrastructure and a large number of other PDF links, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier further indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's designed to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://gettraff.ru/strik?utm_term=wii+operations+manual+system+setup+pdf In PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/ruxozukozuvazu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380701/normal_5f9157fb12177.pdfIn PDF document text
    • https://basafokadu.weebly.com/uploads/1/3/4/7/134706648/319007.pdfIn PDF document text
    • https://firebawoba.weebly.com/uploads/1/3/4/6/134659507/4997358.pdfIn PDF document text
    • https://kusuxifitumaka.weebly.com/uploads/1/3/4/5/134593182/pururotefigetuk-notubuwemowilep-wugivare-revobusujutota.pdfIn PDF document text
    • https://gobisenuginofaz.weebly.com/uploads/1/3/4/4/134490447/9299766.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378404/normal_5fa8205d7bd4f.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/49aaf01f-e794-439e-8137-0db948b6b837/60406566766.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2633bd50-f93f-4a01-a52a-78f5eca12989/making_america_a_history_of_the_united_states_6th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd311b2b-8125-46b4-b7e2-02859ea6fc0b/wekixatunoxotodimupubi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e2b5436-3de6-41d0-a06f-1897f5688d21/isc2_ccsp_study_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee2f9314-a261-4e8f-9ed2-8ccc5510fc53/american_lion_andrew_jackson_in_the_white_house.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5ee31cc-27c3-4d3f-8536-0f97fe87e5bf/way2sms_app_download_for_pc.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_off0000d076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD076 5300 bytes
SHA-256: c6e1a97501c986a3e208b143830a1a81caa6c846d276df3b57a99c6eea34de7a
font_01_sfnt_off0000e27b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27B 10376 bytes
SHA-256: 3b401610d0308d17b07ae4770dbe4ad27b66f507a0b470f1f3c36322376381de

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