Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c71771ed49ed15d…

MALICIOUS

PDF

70.3 KB Created: 2020-11-16 16:00:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: c78a5e85eed178357d3799a20f4bddf3 SHA-1: 2397a161ba7649cae6121287a13e56b6dee14533 SHA-256: 4c71771ed49ed15d3bb53a196824ef4ac4942f2ca6a9dc54bcc8c5c24fea5882
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 0.9997

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://traffine.ru/strik?utm_term=the+promised+neverland+isabella+lullaby+sheet+music PDF link annotation
    • https://boxagabopevonud.weebly.com/uploads/1/3/4/3/134353696/5893872.pdfIn PDF document text
    • https://welawebunigekuk.weebly.com/uploads/1/3/4/7/134713971/07c9c.pdfIn PDF document text
    • https://kirasupi.weebly.com/uploads/1/3/4/4/134442552/6221448.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/f1de402e-9357-4c51-9853-efa9c181aab3/97461004509.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92d8d922-e3b6-4e09-9d2d-8179d2b3d7f0/nomijifikapugijuwed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dd19e37-a064-41e0-816c-0b7c11f60964/70687972057.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/550510e7-6ad5-4eba-93cf-2b35e967332d/headway_beginner_workbook_with_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84664b36-5ac0-408e-8cb2-52668edcb473/68214453341.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51116a19-2578-4849-9b54-6481e21e4153/historia_del_toro_mambo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf09639f-4cde-4ad3-a2a2-2092abfafe98/foxesajebiguz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78b5a530-43c6-4a96-b082-c2d328090f74/mukogosadefokapesozoloreg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99c1c1e9-272f-4c52-8b3c-6aea547b82cf/singham_title_song_download.pdfIn PDF document text
    • https://s3.amazonaws.com/petubapizo/jazz_christmas_songs_piano_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d96cd43-ddd5-4cc6-82af-757ae11b4192/94646370014.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c08f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC08F 4736 bytes
SHA-256: ab8709333a64968aac84700df69fc79175d432e0209369a04796b4e81f96e80f
font_01_sfnt_off0000d12d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD12D 5564 bytes
SHA-256: 39b6431137fb3d70c57796ea2390ac7a7bdc3dd00eff8c572c82c6219ac69673
font_02_sfnt_off0000e3f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F4 11364 bytes
SHA-256: ab0795114238856010807e69fc62e1424edebd34f7adeaeb11629adfdf4b6103

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