Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b21453846990edc…

MALICIOUS

PDF

77.8 KB Created: 2021-05-07 16:40:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 9b95e51cc413a2f96389260f7679693f SHA-1: a8592e6274b54be10d58e8a049818a3c8f4d59ef SHA-256: 1b21453846990edcdecf419fbbadc393386e77e7bf64930e1a93160d0891c8cf
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm designed to redirect users to a malicious URL, likely for phishing or malware distribution. The PDF structure itself is also suspicious, with a large number of external links, suggesting it's part of a SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/strik?utm_term=harry+potter+7+part+1+book+chapters PDF link annotation
    • https://mokapojigum.weebly.com/uploads/1/3/4/6/134690111/141e3a.pdfIn PDF document text
    • https://judavolegarar.weebly.com/uploads/1/3/1/8/131871921/9901621.pdfIn PDF document text
    • https://gisijenoxumo.weebly.com/uploads/1/3/1/4/131437849/9801961.pdfIn PDF document text
    • https://xixurisegiwawaz.weebly.com/uploads/1/3/4/0/134012782/godovamemoxa.pdfIn PDF document text
    • https://jokilexagazoxo.weebly.com/uploads/1/3/4/6/134602179/2595800.pdfIn PDF document text
    • https://juniverobov.weebly.com/uploads/1/3/5/3/135317499/nifogonurinof.pdfIn PDF document text
    • https://zowadadevifu.weebly.com/uploads/1/3/4/5/134597758/8952669.pdfIn PDF document text
    • https://wawumojobov.weebly.com/uploads/1/3/5/3/135323155/69346577a80.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/tetenifeme/ansible_yaml_file_format.pdfIn PDF document text
    • https://s3.amazonaws.com/budovewesekaz/vulamolobivemaxesi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7592eb17-d880-4720-9b31-a0db2d5a9b09/algebra_1_unit_2_test_equations_and_inequalities_answer_key.pdfIn PDF document text
    • https://2ed821ec-8078-4e74-b11b-c5cec6a88262.filesusr.com/ugd/65e777_edd75d1bdaa44649a52be132999e3756.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/62396600497.pdfIn PDF document text
    • https://0e75ab8e-f6a1-4360-bef2-1d94e06fde4e.filesusr.com/ugd/c0518c_37d0dd0a9fd74f5bb947f22c7c9a1d8b.pdf?index=trueIn PDF document text
    • https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_cac586f3816b49929500837d3c391cf6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/239228d5-1a15-43ad-9fd1-14e7faa260c2/new_catholic_encyclopedia.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/bumper_offer_telugu_movie_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/how_to_use_a_convection_oven_to_reheat_food.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/lijilubatinepon.pdfIn PDF document text
    • https://e57d8632-f742-4524-ada6-9cdf759d9f13.filesusr.com/ugd/b0cb2d_74bf6b0aaf1443f1a92870890a49f1cd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jotizifime/gunizukarasusazofe.pdfIn PDF document text
    • https://s3.amazonaws.com/lanaladu/how_does_an_enzymes_shape_affect_its_function.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_off0000f115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF115 5388 bytes
SHA-256: eac7b3452fdb159b00e001417cde71a4d5cd39973736b4b46dc22deb25c62a68
font_01_sfnt_off00010370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10370 11260 bytes
SHA-256: 7284cad39bab13585b498f7f9831b11b043215a13e41fd198ab9d16485afac79

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