Malicious PDF — malware analysis report

Static analysis result for SHA-256 a250be214a64fe5f…

MALICIOUS

PDF

59.3 KB Created: 2020-11-14 12:33:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: cbfa3751c000a4424c4cf82fe0ab61c1 SHA-1: d8c01f68e865267df5cacb3f438f03aa72586021 SHA-256: a250be214a64fe5f32fd0fe095173e1f59e343dc67e092920fe92632b33d81fd
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 0.9996

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://traffset.ru/123?utm_term=organic+chemistry+klein+2nd+edition+solutions+manual+pdf PDF link annotation
    • https://wepoduxusuduxi.weebly.com/uploads/1/3/4/3/134306179/269cb5579523f38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374521/normal_5f8bb9e96544b.pdfIn PDF document text
    • https://dibozavo.weebly.com/uploads/1/3/4/5/134501923/jotituva_kujovax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403283/normal_5f9ab8e81c7f7.pdfIn PDF document text
    • https://masagepa.weebly.com/uploads/1/3/4/0/134096256/6609955.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/fe90e066-2ee3-4292-a901-5878ae18be64/arkham_knight_dlc_skin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88607555-d921-471b-9d03-e97b46ba9018/pidotiwaxulenuwewa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/677b4881-972d-429e-b303-70c46612f6d4/panafofawujub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a5a5b03-2d1c-42b0-bc64-c817c42cf9a1/poviduxexupivogamovenawum.pdfIn PDF document text
    • https://s3.amazonaws.com/kimoweworape/tesapefevujupuresoxeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2696b1fa-da21-4bb5-8d07-0a03430d138c/to_whom_it_may_concern_sample_letter_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc8972c5-dce3-4cbc-bb99-e53e2a71c9b0/vajutopowax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1c14064-55dc-4a6d-9070-872c1ddcd071/introduccion_a_las_relaciones_intern.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/924e0c17-2bcd-46e8-a296-b721f59e407f/sazubamasasotobisofufofaw.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_off0000ad43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD43 5896 bytes
SHA-256: 480d14686ab4918c0408342f593ed44489a29860aa8011cf6bdaaefaab9d0f2b
font_01_sfnt_off0000c136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC136 8940 bytes
SHA-256: 795a0e3416b3f63e9cc1d64277849f1d66d94a775dd853a6bcec13ccf7839440

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