Malicious PDF — malware analysis report

Static analysis result for SHA-256 d378ce2ffdc6ed75…

MALICIOUS

PDF

40.6 KB Created: 2020-11-06 00:39:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 11da06abf2a22bd50c0beb41755d56a3 SHA-1: 268ee41999d31f8bf23e674958e5dce845c1ecd6 SHA-256: d378ce2ffdc6ed75af72d2d8eda99c9e2c7ad310ede6f7c898711d36ccb5c596
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of embedded external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The heuristic 'PDF_SEO_LINK_FARM' specifically identifies this behavior, indicating a potential attempt to distribute malware or engage in phishing. The presence of an embedded URL and the ML classifier's high confidence score further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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://traffnew.ru/strik?keyword=non+foliated+rock+names PDF link annotation
    • https://mupibidegupek.weebly.com/uploads/1/3/0/8/130874042/1430795.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388412/normal_5f8ee5cd9dbf0.pdfIn PDF document text
    • https://naxedomabaxa.weebly.com/uploads/1/3/1/6/131606472/208fb1fa3a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366350/normal_5f90926b35f7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375204/normal_5f8de91c3934a.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/nafoxuda/daxotovexikutakalawam.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/quiz_astronomie.pdfIn PDF document text
    • https://s3.amazonaws.com/farezelof/destiny_2_cant_get_imperials.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3e6aa29-b984-457c-86f4-d400b5fc890a/77554379233.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a81f7e3-8ed3-43f2-91b1-9cc887a14806/87771741690.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cbd8e90-05ae-4f45-adb3-118d97d6ccad/pamebojinek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/611bb6e5-ec85-4d85-8449-eb18106b497b/lamibolu.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/zitigufizoxegutokapunefo.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_off00006297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6297 5200 bytes
SHA-256: beb6f3222ba62ca61c6fe4d03c29165b6e04efe62027777078f46dfad3311842
font_01_sfnt_off0000743c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x743C 9912 bytes
SHA-256: 6f34af0127af0f50b56542e5b6ca24f6fb155a37a31d9038e544d7d3f2cab1f1

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