Malicious PDF — malware analysis report

Static analysis result for SHA-256 de8ec22956538a6e…

MALICIOUS

PDF

77.0 KB Created: 2020-11-24 08:45:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: dd9a27ee55eb60cc73d0e41100fd901a SHA-1: d961e4b97297dc93a889a2797df64702b9202720 SHA-256: de8ec22956538a6eb2e1b464663b2b913048e33aaf298c836e260913a5d003f5
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 0.9998

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://traffnew.ru/123?utm_term=daniel+lapin+thou+shall+prosper+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384831/normal_5fb5326b4e730.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366659/normal_5f87300e82600.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390681/normal_5fad6b572b322.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466689/normal_5fa8b7c5d9575.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408851/normal_5f988e01e443e.pdfIn PDF document text
    • https://musejeruz.weebly.com/uploads/1/3/4/7/134740211/tumijaji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377662/normal_5f90a4a44236f.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/jolon_koxuzozudanik_makilitinami.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/bevarolimesale/83294276270.pdfIn PDF document text
    • https://s3.amazonaws.com/wokesabisevo/fesibumabudulozipe.pdfIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/24740077829.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9347d83-741e-49b3-8970-8ef2cf6814f1/wgu_c229_time_log.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/adeept_ultimate_starter_learning_kit_for_arduino.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_off0000f22b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22B 5128 bytes
SHA-256: 593858b41fdd464e75cf29a6fc550c9faa46ab64e4acda06fedf5ffe7b43a798
font_01_sfnt_off00010398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10398 10236 bytes
SHA-256: eac909b5812bd8c444eee6a601bfa6e9f0daf707ceaee1b07c65a8cef5e8dba8

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