Malicious PDF — malware analysis report

Static analysis result for SHA-256 0186f14fc203935f…

MALICIOUS

PDF

69.9 KB Created: 2021-02-21 21:05:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 5a1673a6ef9442934500ce9e0c13b2ba SHA-1: cedfa273f3fda75d5190e7a57022ba1ce5160bca SHA-256: 0186f14fc203935f358a9c87bf9cd026b3e5d3d745e6719ccfeb5f9bd53206cd
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of a large number of external links, including one pointing to 'seumenha.ru', suggests a link farm or redirection mechanism. While no scripts were explicitly extracted, the PDF structure and the nature of the heuristics point towards a phishing or SEO manipulation tactic, potentially leading to further malicious downloads.

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://seumenha.ru/strik?utm_term=playboy+mp3+download+320kbps+mr+jatt PDF link annotation
    • https://vanimiravupu.weebly.com/uploads/1/3/2/7/132710567/06c513bee8ffe.pdfIn PDF document text
    • https://kupelaranix.weebly.com/uploads/1/3/4/7/134729830/2013079.pdfIn PDF document text
    • http://italy-small.space/brisingr_book_online_freehfbk8.pdfIn PDF document text
    • https://doxekitonibi.weebly.com/uploads/1/3/5/3/135326555/fixalajomugemuju.pdfIn PDF document text
    • http://goodsun.fun/mupulegiq5jvd.pdfIn PDF document text
    • http://reestr.site/nursing_scholarship_essay_templated9itg.pdfIn PDF document text
    • https://kaperimivegorew.weebly.com/uploads/1/3/4/3/134371305/xisibiritefu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/zaraludawojinosogom.pdfIn PDF document text
    • https://s3.amazonaws.com/sebunuzu/18441482472.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/atlantic_starr_masterpiece_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/online_pool_table_game.pdfIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/facebook_photos_original_resolution.pdfIn PDF document text
    • https://s3.amazonaws.com/wuvepilamamuse/steelhead_fishing_report_deschutes_river.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/63402733360.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/54068842358.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_off0000cfe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE0 6016 bytes
SHA-256: 06a09c77ce31cfdd571fb4c4b1d5f7f25e067a9da5ec381847008f846f44e43e
font_01_sfnt_off0000e459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE459 11264 bytes
SHA-256: 1e37c4af9ad4ed4fe500b9096e647c9c7bd55028738117c22300518bfbc3aa6d

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