Malicious PDF — malware analysis report

Static analysis result for SHA-256 f19b7805b7c8ee87…

MALICIOUS

PDF

58.8 KB Created: 2020-11-24 02:40:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 77097cf8b5dc331bf998d3db594b7d30 SHA-1: 1dd208d63a8c676f1af8afea86e6df78072d1cde SHA-256: f19b7805b7c8ee87f36e9be8fe2cebbc81db70951cce301debe72e77e0e69cee
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains a large number of external links, with 'traffset.ru' being a primary example. This indicates an attempt to redirect users to potentially harmful websites, possibly for phishing or malware distribution.

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=words+with+igh PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416151/normal_5fa9e6c6ba644.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/jolon_koxuzozudanik_makilitinami.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374533/normal_5f8a0947ce55c.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/b8ff08e2-a628-47d6-8e6b-d7446ace6a96/live_pd_jefferson_county.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da63ba7d-51b6-4084-b076-ecfd5f04bb7e/riccar_sewing_machine_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/968ad8cd-f2ee-4f06-91ed-ba85f9c6e40f/19577639140.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc3890e9-6480-42b5-ad11-29ef27d4d21d/lapovikexovitojefozeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96248765-31ce-4523-a89f-17ec464616f0/fagokapexegosapifiwu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bea7faf4-c773-4f03-9b63-64fb22ca06aa/87568258081.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd7ad84b-9613-4339-84b9-227f1d335a6f/don_quijote_dela_mancha_vicens_vives_clasicos_adaptados.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fa2c4c1-8706-4071-9bd5-0595177e2172/bamovonuti.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_off0000ad8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD8B 4952 bytes
SHA-256: ef4849ce4a2457e7fdd640cf3425f82473e9f676d8b72d5b6af77f7e6955eda6
font_01_sfnt_off0000be73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE73 9544 bytes
SHA-256: d93d034fb43c82ed310bb4b759f4bb40df7c2380ff6609da5a5110c6550108ec

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