Malicious PDF — malware analysis report

Static analysis result for SHA-256 90328aa0311fe50a…

MALICIOUS

PDF

91.5 KB Created: 2021-03-27 23:10:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f03147f4f899771e6e6b4b6c9e805c97 SHA-1: 5931f03fc7f2c1e0bff00b14bed4df6b55fc68bb SHA-256: 90328aa0311fe50a8df517ade7fc7bce4b0b99633a0f2acf6193c3500f0b52eb
156 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/123?utm_term=android+10+release+uk PDF link annotation
    • https://xikemusuvef.weebly.com/uploads/1/3/4/3/134322181/xijesozejine-mefanekekeguvir-nezexupo-duxamuti.pdfIn PDF document text
    • https://wonakusoxenim.weebly.com/uploads/1/3/5/3/135340368/gujavitomus_basefomaniwet.pdfIn PDF document text
    • https://cdn.sqhk.co/zetoreli/VjDheGX/jebamosulaga.pdfIn PDF document text
    • http://wiwafapudipib.iblogger.org/c_programming_basics_tutorial.pdfIn PDF document text
    • https://cdn.sqhk.co/koxajavu/cidZ26d/bubble_tea_kit_target.pdfIn PDF document text
    • https://cdn.sqhk.co/xafemepino/luHgfCi/planetary_alignment_july_4th_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/lididiregi/kZ3gi6o/badass_samurai_quotes_in_japanese.pdfIn PDF document text
    • https://cdn.sqhk.co/vizakifito/eR2rsid/hide_and_seek_online_games_no_downloads.pdfIn PDF document text
    • https://dojilosadokadog.weebly.com/uploads/1/3/4/8/134890500/3635753.pdfIn PDF document text
    • https://bogekivusuwi.weebly.com/uploads/1/3/4/6/134604255/759835.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/pasawe/gurisokoxegutavex.pdfIn PDF document text
    • http://sobegomogi.rf.gd/19370920679.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16fa2cb9-586b-480a-bf7a-98da647792dd/15187949349.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/lujet.pdfIn PDF document text
    • https://s3.amazonaws.com/netinuwa/halo_wallpaper_4k_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/942c4fa9-b100-4013-9b36-afecd6dc8edd/33595878253.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/gastroenterology_guidelines_hepatitis_b.pdfIn PDF document text
    • http://gezobejutewevu.epizy.com/gotiretiruvamaku.pdfIn PDF document text
    • https://s3.amazonaws.com/divikufifir/counter_offer_letter_template.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_off00012720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12720 5068 bytes
SHA-256: ce8042eeba33e1bee25a3ede4450d8ceeac0c8cd3d5e697b0501c110ac56836c
font_01_sfnt_off0001386b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1386B 11900 bytes
SHA-256: 832faf69ec7ccefeaaa336128349a0abdc5aa4a1eb1ff04658a5d83a44ead38f

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