Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7b08a57db5e2205…

MALICIOUS

PDF

77.3 KB Created: 2021-05-31 06:28:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: ac503b6558aacb1b1e8b7a701276baa4 SHA-1: e028063b3248884f2e566fcb50bc55287f09b2a5 SHA-256: e7b08a57db5e2205c13b1b33acd0fe2c8ee5dbe94e51b52292d5d0ab45391579
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links, with at least one identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate a strong attempt to direct users to harmful sites. The ML classifier and ClamAV detection further support the malicious nature of this PDF, likely used as a phishing lure or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://yafferge.ru/strik?utm_term=exemple+de+texte+descriptif+pdf In PDF document text
    • https://bafiredevidif.weebly.com/uploads/1/3/1/3/131384403/707091.pdfIn PDF document text
    • https://jumemovelavubar.weebly.com/uploads/1/3/4/5/134516611/zejut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458161/normal_5fd661e4e5e2d.pdfIn PDF document text
    • https://dobojadu.weebly.com/uploads/1/3/2/7/132711966/3830104.pdfIn PDF document text
    • https://tamoniwezetiro.weebly.com/uploads/1/3/5/9/135961995/51c575.pdfIn PDF document text
    • https://jadufebifov.weebly.com/uploads/1/3/4/6/134627690/xomotuzugob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484122/normal_60367e4490c5b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c8d503e-296e-4e02-9632-dfedfee63a79/mr_bean_animated_series_season_3_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/443342a5-6d62-4764-9a21-56ea5f9ccfff/lunemusit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c4c786f-f557-4319-b7a2-91b67eacb7b6/53929137508.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab9f9da7-0e97-45a8-bc3f-70030df9853f/platon_allgorie_de_la_caverne.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/822a22e4-9da9-4690-87ed-36665a8254e5/how_to_build_a_million_dollar_lawn_care_business.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74f6bb90-55db-473d-a3fd-3d6250a442f7/33447839888.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d1d067a-d6fa-44ed-a242-65f834e28ac2/what_is_the_theme_of_the_poem_if_i_were_an_angel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d728c38-dcf1-4360-abf8-4c3d3f03586c/resedunuta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d741369-5503-40df-8dff-e67484c0371c/ninjutsu_training_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/119765e4-f3ac-4a46-8a2a-af5f29273206/volume_of_a_cylinder_cone_and_sphere_word_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45bf0869-5485-4ffd-a791-ed1c66e2c6a4/bernina_record_830_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b481dcb9-215a-48d1-b8b8-d9cbf9119091/61027387810.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9874010-fd9e-424d-864f-ec035ee9b4c1/how_to_limiting_factors_affect_carrying_capacity.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_off0000ed9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9A 5116 bytes
SHA-256: 25905fb34355f586660ab34b779521581e6168564c2ab0f68599ff4c16bf1521
font_01_sfnt_off0000fef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF8 12520 bytes
SHA-256: 0acfc96f82969ccc5676d3e1830ed3a3b4f9c9e1d78906a6af0a0617562e015d

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