Malicious PDF — malware analysis report

Static analysis result for SHA-256 be1e43170d85d563…

MALICIOUS

PDF

81.1 KB Created: 2020-12-04 23:13:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 4dda53da01bedf675213bc4521bb6640 SHA-1: 23f2bde3e9156fed8c0b444a834e413334395432 SHA-256: be1e43170d85d5633cdd05226d05b5c996a270fb04b13256b88f9b20c96987d9
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, many of which point to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_URI' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure points towards an attempt to redirect users to harmful content.

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
  • 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://trafffi.ru/123?utm_term=is+paint+homogeneous+or+heterogeneous+mixture PDF link annotation
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/83905a54a030772.pdfIn PDF document text
    • https://dirifanijademad.weebly.com/uploads/1/3/4/8/134898971/jesoxosaxozepukemako.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365525/normal_5f8f2a06e16a3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc31c7792c50b1a1e85f0fa/t/5fc97ca82f5dbb44b77082b9/1607040170913/galodebiwavoz.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc11cf00a2757459be424fe/t/5fc525e55147b14804d7c3db/1606755814008/betubufirimaduwafew.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f24c403f5353fd95fd42/t/5fc1fe563570fb44d1493fe7/1606549078960/pazijumovarelorimelase.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0d785085bf90c0efcc6ad/t/5fc1214564571256546406bf/1606492487060/leadership_theory_and_practice_8th_edition_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1fff387-efc8-4114-b41f-d82217e52f8f/37058742825.pdfIn PDF document text
    • https://s3.amazonaws.com/tesapibebujep/schlage_be365_v_cam_619_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dd7fd42-c21f-4cd9-8d1b-4f78c2e9bc54/jopapuginobixudopeviziso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/093646a9-a452-4bc4-b6d8-0d91432e8858/zobapibikilukufisukaso.pdfIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/drafting_blouse_patterns.pdfIn PDF document text
    • https://s3.amazonaws.com/toguvaju/91944650332.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_off00010045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10045 5208 bytes
SHA-256: 1ecf6eed53ba39a5a66127e3eca26e92ac0b6b87534ea5511c49c1f418c5c13c
font_01_sfnt_off000111d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D7 11084 bytes
SHA-256: 1a4cd3e20e01f241315fe87044d279862b6befc763447d9b3e6d15d226806911

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