Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b36f3cb14c78923…

MALICIOUS

PDF

74.2 KB Created: 2021-02-28 06:43:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 226b568ce35643620267de675b27744b SHA-1: dda1d5f738f1f06c7f01e003ffb458363a2d1ca2 SHA-256: 3b36f3cb14c789238b5d90015304b812be3b7e7cebde7b0fd2c32b2b9eed6fda
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO poisoning tactic. One of the primary URLs, 'https://maypoin.ru/strik?utm_term=how+do+you+crochet+a+small+dog+sweater', is presented as a search result to lure users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

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
  • 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.
  • 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://maypoin.ru/strik?utm_term=how+do+you+crochet+a+small+dog+sweater PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4481675/normal_6006a9e281571.pdfIn PDF document text
    • https://xubejuvanexog.weebly.com/uploads/1/3/5/3/135311054/guninamuzas.pdfIn PDF document text
    • http://najetaxu.mygamesonline.org/nuance_power_advanced_1.0_download.pdfIn PDF document text
    • https://wuzajamepoxomis.weebly.com/uploads/1/3/4/0/134096323/2732327.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368978/normal_6004b16058de0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383912/normal_6006895f41ee8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491432/normal_5fcddc4f5fade.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424349/normal_600bb7a86ae17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377098/normal_601468ad1b5be.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454681/normal_5fe18af38db5f.pdfIn PDF document text
    • http://vurovolapoza.mygamesonline.org/curtis_sno_pro_3000_cutting_edge.pdfIn PDF document text
    • http://wotidoteked.mywebcommunity.org/how_many_carbs_are_in_an_old_fashioned_glazed_donut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444104/normal_602e645512f2f.pdfIn PDF document text
    • http://sawedes.mywebcommunity.org/tubunimezeweluzewejito.pdfIn PDF document text
    • http://zumewidife.mygamesonline.org/61226016414.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rewuwuja.onlinewebshop.net/roliraz.pdfIn PDF document text
    • http://gekolutewubel.myartsonline.com/mototijupuwekeg.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_off0000e2ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FF 5508 bytes
SHA-256: fb5ac1a68097f7fe67e03028505e83c911d5105c5ea0ca7cc8cd07698a75b99f
font_01_sfnt_off0000f5a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A5 11096 bytes
SHA-256: 75a4e0861f89569c6b9aa57c2ed6bfb302a5550309a6821f29734d98e3ec113e

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