Malicious PDF — malware analysis report

Static analysis result for SHA-256 41f0bdd71dc53409…

MALICIOUS

PDF

65.7 KB Created: 2020-11-16 12:40:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: df80e4233c55bb98a783ca2bf786fea9 SHA-1: 9bddaa261ce8aa1a91cde3c918c56ed18898f5b0 SHA-256: 41f0bdd71dc5340952228a8dcf591685ada9a9074a3936035a3d5c21c2a3fc2f
156 Risk Score

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 0.9996

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://traffnew.ru/123?utm_term=instituci%25C3%25B3n+de+la+religi%25C3%25B3n+cristiana+tomo+2+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366033/normal_5f987c4e503e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425924/normal_5fa9855aab59c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379229/normal_5faec4e4c2773.pdfIn PDF document text
    • https://kupanonul.weebly.com/uploads/1/3/4/6/134682697/duvijodetan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421365/normal_5fa428fb4a3ad.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/lokijuronig/antidiabetic_medication_classes.pdfIn PDF document text
    • https://s3.amazonaws.com/petuzutemixuvod/51838524649.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/androides_sonham_com_ovelhas_eltricas_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5c421b0-1ec2-49d9-bfe3-418fbbcc0ee1/pirate_ship_stats_5e.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d1eb322-05a9-4c60-873b-a712d8a25167/busafofupu.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_off0000c026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC026 5680 bytes
SHA-256: 6a61954f2c352227df981a4a44e84eb68ea41fa26c3a4b09137035901b252110
font_01_sfnt_off0000d329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD329 11400 bytes
SHA-256: 8742fbf57407b5bb44d5433a671c76fc9bcd2ecad8ddad0276ea68eddfe64f64