Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6862d7e50698a4b…

MALICIOUS

PDF

83.5 KB Created: 2021-03-01 01:42:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 50502f53aa9ff87b42b4f803bd1e785c SHA-1: 951d65b10703c6c6400564a6f69334b6259ee79e SHA-256: d6862d7e50698a4b94d5a1621bcb36ae2bfad0fd5baf4c3d60a7dc8599a51dc8
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pelibifir.ru/wix?keyword=pewdiepie+apk+day%25C4%25B1 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4418746/normal_5fc6d99184157.pdfIn PDF document text
    • http://wide-mean.top/uc_browser_9._5._0_java08z1k.pdfIn PDF document text
    • http://bimefuwede.iblogger.org/angadi_theru_movie_video_song.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444370/normal_60235394e243c.pdfIn PDF document text
    • https://fimudelowuj.weebly.com/uploads/1/3/1/4/131455024/9b14f56c56bd937.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405899/normal_5ff8db7d7a2c5.pdfIn PDF document text
    • http://rodina38.ru/71364567208qfmak.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418973/normal_600539e55ca32.pdfIn PDF document text
    • https://nutomejeti.weebly.com/uploads/1/3/4/7/134702699/5585593.pdfIn PDF document text
    • https://rigozogukex.weebly.com/uploads/1/3/3/9/133986215/bigozadevos_rijakuxo_pimozufopuwete_wamole.pdfIn PDF document text
    • http://bowanizi.22web.org/64462147437.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/wovugi/91812743117.pdfIn PDF document text
    • http://tewapodu.rf.gd/78338162541.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/alesis_crimson_2_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/tisegovofu/consumer_reports_best_french_door_refrigerators_2017.pdfIn PDF document text
    • http://tanozetodane.rf.gd/java_bytebuffer_vs_byte_array_performance.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/o365_mailbox_permissions_report.pdfIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/45803909586.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_off00010b51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B51 4936 bytes
SHA-256: 8db5829719d85bca88ccacea0767bac888172f5c3b8ebec56033471d76531d93
font_01_sfnt_off00011c53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C53 10236 bytes
SHA-256: d7d56482207800f041a5a23a88aeea74305a1c40730970dae006ef64714f3d16

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