Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb13a967b73253b9…

MALICIOUS

PDF

70.9 KB Created: 2020-11-24 00:29:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a99ac2c88ed8c59584acfc1d75e10098 SHA-1: 959ad2d200cfa1b16fe954455326ec0a54e3fb3b SHA-256: bb13a967b73253b9891adb2e83a4fd91bc5c9bbdd3c10fcee9839b7ceca67b3b
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://trafficel.ru/strik?utm_term=programme+d%25C3%25A9riv%25C3%25A9e+ti+82 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4444377/normal_5fa14d7222f2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414871/normal_5fb5df4022630.pdfIn PDF document text
    • https://xejibojap.weebly.com/uploads/1/3/4/3/134310503/6566780.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421474/normal_5f9852f97dd44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366976/normal_5f9b1cb33bd38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403954/normal_5fa5b7f23e350.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/metakibeme/likovemilo.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/magic_tub_and_tile_refinishing_kit_msds.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/541bf9c7-1eb1-40c7-a7d1-7a7f0cc667b2/jepivovulusufajo.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/latest_telugu_movies_free_sites_list.pdfIn PDF document text
    • https://s3.amazonaws.com/kewakuko/machines_science_olympiad_wiki.pdfIn PDF document text
    • https://s3.amazonaws.com/figugipopar/rusco_spin_down_filter_cleaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1179961e-59ac-4bcf-b649-bf0f1c056cd8/najusujararepabunosamuso.pdfIn PDF document text
    • https://s3.amazonaws.com/fibesezati/sunegekuzawiniguki.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_off0000d2bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2BF 5464 bytes
SHA-256: 13e8efd77e5f40c98627152bf1c01f50e214eca1e06ea424de7da38f28b20d1f
font_01_sfnt_off0000e4fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FC 12816 bytes
SHA-256: 38cf4e84daad669dc084bec4b479ab59975f8874becce9ed331c2a0995f41609

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