Malicious PDF — malware analysis report

Static analysis result for SHA-256 84c8a959164d66b3…

MALICIOUS

PDF

68.9 KB Created: 2020-11-21 05:57:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 9efb22a988437af1609693811ac01b7a SHA-1: 9b6062ff371ebcc273ace9ce323c320048e297d3 SHA-256: 84c8a959164d66b386d83390cb95b3939e31442d63a87503744215adf8e86dcc
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though partially corrupted, contains text related to 'Ragnarok classic mage guide', likely a lure to attract users to the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://trafftec.ru/123?utm_term=ragnarok+classic+mage+guide PDF link annotation
    • https://dawewixorumerix.weebly.com/uploads/1/3/4/6/134633471/jevofewogo_rapenufu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369917/normal_5f8a70915b21c.pdfIn PDF document text
    • https://jiwepurojal.weebly.com/uploads/1/3/0/7/130775762/6630849.pdfIn PDF document text
    • https://mijisurux.weebly.com/uploads/1/3/1/0/131070147/gijoketizob.pdfIn PDF document text
    • https://supavutoni.weebly.com/uploads/1/3/4/7/134713891/zusexolalo.pdfIn PDF document text
    • https://kusebedanosude.weebly.com/uploads/1/3/1/1/131163667/vebuzok-jisotopelipez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390052/normal_5f9a94da84d22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425005/normal_5fb5a38307bfe.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/0a982bf6-52ad-4930-9110-0e08af53c0d9/vagagiwidulidipaxega.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b775085d-a942-4bdd-b7ca-538d14a7de02/76086479283.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7edf3b87-6ebc-403c-81e5-d680feb1401d/weeride_kangaroo_seat.pdfIn PDF document text
    • https://s3.amazonaws.com/jeduzizonox/jio_music_apkmonk_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/jutenojamega/hotmail_google_email.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_off0000ceef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEEF 5328 bytes
SHA-256: 09d920c41f0fd381004c32a7e789161b9bac095a753cde9a447944eb31c87ef6
font_01_sfnt_off0000e104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE104 11204 bytes
SHA-256: 64f3e6dc597bcb609da7452a6db8b0062160bd21b520f193851dded25206f603

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