Malicious PDF — malware analysis report

Static analysis result for SHA-256 c89f6a207fafb1bd…

MALICIOUS

PDF

66.4 KB Created: 2021-02-26 03:22:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 728d2a87bfcebbbd3bbc5dcbf92e3cd7 SHA-1: e6a4a6261d27804a4684bbf6dad850ebba3c22c7 SHA-256: c89f6a207fafb1bdd34067b0c2e8e33c1c2c9914d2919c4fb4b91ea4ce745bf3
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and redirecting to malicious infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains keywords related to financial literacy, suggesting a lure to disguise the malicious links.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=introduction+to+financial+literacy+crossword+puzzle+answers In PDF document text
    • https://cdn.sqhk.co/xomorenut/aVSibgf/87595938681.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4528780/normal_5ff70ae052328.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414498/normal_6001c72d0c15f.pdfIn PDF document text
    • https://cdn.sqhk.co/libavesonon/JifHjjt/best_songs_of_the_50s_60s_and_70s.pdfIn PDF document text
    • https://cdn.sqhk.co/xilasexiki/Cjgjigh/98686160294.pdfIn PDF document text
    • https://vilabusifa.weebly.com/uploads/1/3/0/7/130776169/guvazularuz.pdfIn PDF document text
    • https://cdn.sqhk.co/mutexeze/Oibhf8C/54378221551.pdfIn PDF document text
    • http://kikababono.mywebcommunity.org/sony_dav-tz140_remote_app.pdfIn PDF document text
    • https://cdn.sqhk.co/finelega/9wVPhaq/xetoremo.pdfIn PDF document text
    • http://fajujefa.getenjoyment.net/free_printable_maths_worksheets_for_11_year_olds.pdfIn PDF document text
    • http://golixudib.mypressonline.com/how_to_place_a_forex_trade_for_beginners.pdfIn PDF document text
    • https://lujukote.weebly.com/uploads/1/3/2/7/132712447/9c3b19574ee34.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/fulazelof/carbs_in_taco_bell_steak_soft_taco.pdfIn PDF document text
    • https://s3.amazonaws.com/fukepez/nadanupazakuruxa.pdfIn PDF document text
    • https://s3.amazonaws.com/kiguteperilodu/34434113330.pdfIn PDF document text
    • http://gutekuretejapoj.onlinewebshop.net/how_to_assemble_shark_navigator_lift_away_deluxe.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_off0000c7c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C9 5328 bytes
SHA-256: 585623246953c1dcbee1a2946649e5b60fefd9eaf25a2f3d599954740882613d
font_01_sfnt_off0000da1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1B 9996 bytes
SHA-256: 651111f2ef220d2d2297cc552ce8d6b39849d8c541ee5c44c0000c992a958630

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