Malicious PDF — malware analysis report

Static analysis result for SHA-256 631869a14795171b…

MALICIOUS

PDF

69.9 KB Created: 2021-03-07 07:48:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f7607a68d4b1814b9055fc36c502db6a SHA-1: 9ffd83336f8ffddbe4f3a0500aa21045a9310365 SHA-256: 631869a14795171bab45131c93f1082f07ed96374cf5c7bf02dda66ac564ce44
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to harmful content.

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
  • 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=disc+priest+pvp+stat+priority In PDF document text
    • http://skout.tech/mapunalutolebadafinapoewsb1.pdfIn PDF document text
    • https://cdn.sqhk.co/gibuburi/BnjjgfR/72783994172.pdfIn PDF document text
    • https://cdn.sqhk.co/lebudawojafi/gdM6iaU/42899229733.pdfIn PDF document text
    • https://cdn.sqhk.co/zolulesar/ia8pgiw/ipad_movie_catalog_app.pdfIn PDF document text
    • http://clientesdkb.com/lebekunufukepuvejesovawitipuey.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ddf64d59-5240-4154-9987-17dfc28e22c7.filesusr.com/ugd/cec570_c74178291a92404282eebfe9c03924b0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/tetrads_form_during.pdfIn PDF document text
    • https://s3.amazonaws.com/vovabagubajegeb/jopurolov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07521375-4061-4675-9b2c-07cfcba5f945/the_conference_of_the_birds_ransom_riggs_national_bookstore.pdfIn PDF document text
    • https://s3.amazonaws.com/wixamupelinere/anonytun_prime_terbaru_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/86284086419.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3661537-1634-4d3f-ae7b-72e0cbf52e48/vugamak.pdfIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/zemafemowofawuju.pdfIn PDF document text
    • https://s3.amazonaws.com/davawina/meraku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4b93b7a-b4b0-4362-b8ef-c144f3b035e6/lateral_thinking_meaning.pdfIn PDF document text
    • https://d56a38bf-d62e-453c-9b5b-5b2fe88aea46.filesusr.com/ugd/359e64_ec4536c8f5434d4590a4b3bed51c1c11.pdf?index=trueIn PDF document text
    • https://8eeb1f0a-0cdd-4c66-98a4-83777b49fb54.filesusr.com/ugd/64f9d2_0591663b609142089dae18d19881116e.pdf?index=trueIn PDF document text
    • https://8c1dc56a-a131-4b43-acff-3635b9115217.filesusr.com/ugd/90423f_672a4ef9cf2c45d1a71424b4fd14c194.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bawalidamovidud/free_online_product_label_templates.pdfIn PDF document text
    • https://9e1e9198-0fe7-4103-8084-fdcc6befb8d5.filesusr.com/ugd/2f7815_8b8daaa63ffe4ff6ab6cc1bf3d264b23.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/320d5067-39eb-4750-97be-8422feb0f04f/sig_p238_380_review.pdfIn PDF document text
    • https://s3.amazonaws.com/mubefula/executive_summary_for_intern_report.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_off0000d43d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD43D 5056 bytes
SHA-256: 6ff8703bb7880ee53bd4959ec5481bcd4bb0e028569d7ad8bd9a3542f49759cd
font_01_sfnt_off0000e597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE597 10980 bytes
SHA-256: df3855a21150c93b7db429573f564bec421702077ed4d0869afe84cbdc86857c

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