Malicious PDF — malware analysis report

Static analysis result for SHA-256 d50bc3cdbb8278e1…

MALICIOUS

PDF

71.4 KB Created: 2020-12-08 01:34:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: b0c9e53574c9c7171fbc606a68136b67 SHA-1: 24056ec7cbf258ad901a0cba1aae86e6d01554c6 SHA-256: d50bc3cdbb8278e1167e5a4d58e3905923ba25d43f6df9b1eaa3803c938994fe
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 0.9996

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://trafftec.ru/123?utm_term=lifegate+christian+school+seguin PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378149/normal_5f8ccb213c5a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380380/normal_5f8aeaca6aff9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385631/normal_5fa5ac331a2ff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402707/normal_5fcea6f87712c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393033/normal_5f9aff72eef85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387040/normal_5fa3f2ceb613a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405208/normal_5f95d1d5eca0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376602/normal_5fbacef7de9cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380380/normal_5f909a5397be0.pdfIn PDF document text
    • https://nitetezelimon.weebly.com/uploads/1/3/1/4/131438651/8782dba5a9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/vidadaviwal/crab_rave_sheet_music_violin.pdfIn PDF document text
    • https://s3.amazonaws.com/mekonulegipero/vipewibunogorapilojevax.pdfIn PDF document text
    • https://s3.amazonaws.com/jarawaxanivu/game_basara_2_heroes_android_iso.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/an_apology_for_poetry_original_text.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5E3 4964 bytes
SHA-256: e823458f754a66e571d68d21ac9dfdb19c220b07c908ffe3f2f9d0544b886218
font_01_sfnt_off0000c6c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C5 11368 bytes
SHA-256: 03bb9f16787f64475a4061b92396af92b0b0301b4aba1009be3791eb0e03fcdd
font_02_sfnt_off0000eaf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF7 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501
font_03_sfnt_off00010025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10025 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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