Malicious PDF — malware analysis report

Static analysis result for SHA-256 b447c91744f5ff88…

MALICIOUS

PDF

84.9 KB Created: 2021-01-04 10:20:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 769166fcef6a8e80d16e6d9e6bd94274 SHA-1: 835c3c96e3b8c2f72962e10fb2ba21ae63bd4856 SHA-256: b447c91744f5ff8889d496f3b2cb841e85041752bb5e5ff7bfb88d75257766bf
214 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 routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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://ggtraff.ru/123?utm_term=elementary+principles+of+chemical+processes+solutions+manual+slideshare In PDF document text
    • https://damijuvik.weebly.com/uploads/1/3/1/3/131381376/90913b096d8.pdfIn PDF document text
    • https://wibugosavuzatug.weebly.com/uploads/1/3/4/3/134349607/9158227.pdfIn PDF document text
    • https://kukotefuses.weebly.com/uploads/1/3/1/6/131637352/bawazeloguzu_gudakegesivivu.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/64407293456.pdfIn PDF document text
    • https://s3.amazonaws.com/napisakaluja/lastpass_browser_plugin_chrome_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/052170f7-6f46-424c-946b-6a96ceab7a64/the_outsiders_study_guide_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d7d431f-eeb4-4818-9851-b0d6bb592f97/12256986718.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxuledo/pinunaj.pdfIn PDF document text
    • https://s3.amazonaws.com/nopomewegobij/antibody_structure_instability_and_formulation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0e9aa31-39e7-4de7-a831-4df80cc10e15/install_bz2_file_on_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a1bd375-6b4a-41be-b44b-8de4210c5eba/63588355689.pdfIn PDF document text
    • https://s3.amazonaws.com/gifiz/abc_kids_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9e0ab91-70cd-43a0-9a17-26436a00fc3a/frequently_misused_words_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/pogolo/kejegiwubakuvupakoxul.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE34 1896 bytes
SHA-256: 197d260ce34c6521155e7f48b972025bb287916afc3727787c9566b9402a7c08
font_01_sfnt_off0000f710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF710 5452 bytes
SHA-256: 3b07e87b48e9e584c572ed0699d8faacb54dbb4f14976a0c7722c43b889f66cf
font_02_sfnt_off00010973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10973 10672 bytes
SHA-256: ee7197d4357785fbf01e788f4a9f5177be43da0d724d4190ac087cc9ae90da26
font_03_sfnt_off00012df1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF1 16668 bytes
SHA-256: ca4b3eb92e02bf88130eb85a2f707839ff610b686e641343ce5530e7bdd50f58

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