Malicious PDF — malware analysis report

Static analysis result for SHA-256 db94aa98e554d1fe…

MALICIOUS

PDF

82.2 KB Created: 2021-03-14 15:40:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 981585c43764ccd64b68a072f2e8dbb6 SHA-1: 904f305d32f310ee129522d5e74a54fc80820eb9 SHA-256: db94aa98e554d1fedfc64f0228473927e8c250c03675cabcdce72d115c324493
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 0.9993

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://fokemale.ru/123?utm_term=ashwin+sanghi+books+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4470553/normal_5fffcf338ff63.pdfIn PDF document text
    • http://herss.space/hell_divers_book_wikiwx5t3.pdfIn PDF document text
    • http://myshoes.moscow/which_of_the_following_is_an_example_of_inferential_statistics_criminologyysfwe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366395/normal_600905ff0ec96.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474752/normal_5fe5aca595924.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385011/normal_5fcb5191bbea8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460266/normal_5fd95af3aa168.pdfIn PDF document text
    • http://ch-bewertung-2888.xyz/2224464912uxbdb.pdfIn PDF document text
    • http://wdd13.ru/how_to_restart_acer_aspire_e155bye4.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/miledu/64886920430.pdfIn PDF document text
    • https://354df738-7a8c-4643-bdcd-aa58f7c4bd0c.filesusr.com/ugd/69cf62_7c89d4f07eaa443aa0cfe7c12d25b2c0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bifadiwuwileji/how_to_cite_someone_in_an_essay_mla.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/cummins_qsb_5.9_marine_engine_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/mikibetiv/jikinutosifafakosez.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/paxezuxebaxixozakilulox.pdfIn PDF document text
    • https://s3.amazonaws.com/xeruxaxer/voxarejimir.pdfIn PDF document text
    • https://6f672a44-e16c-4921-a0f1-e3781c0647c5.filesusr.com/ugd/bda22a_7ed8194b0696491e8ab61948fc4b6f68.pdf?index=trueIn PDF document text
    • https://e0220c8c-c322-4c33-af83-7c5b0fe00b66.filesusr.com/ugd/a771bd_0a910e6eced3439680a2054d6d46f0d6.pdf?index=trueIn PDF document text
    • https://acfc0e76-311d-46af-9c13-f46c112eb424.filesusr.com/ugd/f90bad_68e28a8844f94b1b8d5bc6b2f48145bc.pdf?index=trueIn PDF document text
    • https://b64dd490-e5b9-492f-89ff-e398ecee904c.filesusr.com/ugd/5926b4_624b383a2312413d9ec4707da64602a8.pdf?index=trueIn PDF document text
    • https://88966db1-4a83-4446-b941-f65022a6235f.filesusr.com/ugd/928e0f_aa0a0ed8ec0c4e7189e61fce6f53d41e.pdf?index=trueIn PDF document text
    • https://5b0e1d79-1acc-45ba-a965-31015372eee8.filesusr.com/ugd/67f5f7_2df3e67fed054819b67b99b47dbccadc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wupuxus/prince_of_persia_apk_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/povelenavuviw/jetivupomagetavije.pdfIn PDF document text
    • https://e905a76e-7bc1-418c-be29-e8eda1603e86.filesusr.com/ugd/3fb32a_b4e28611b50c4c51b131cf2736209dde.pdf?index=trueIn 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_off00010307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10307 5460 bytes
SHA-256: c136c45f953b4bcbc98b45bc82a81418c5e8dba7b6794e5655831825daec1e32
font_01_sfnt_off000115ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AC 11284 bytes
SHA-256: 681afab2676bb99184f8a08f5eed3900beaa254dcd28eb40a7a54fa3cbe77ece

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