Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d29abd6d7a7926b…

MALICIOUS

PDF

89.2 KB Created: 2021-02-20 19:46:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: ac4568516f9ca5fff2be308d8bf7bf5f SHA-1: 6b669aac0a485dc36afa685921d7c2f01d449ee3 SHA-256: 9d29abd6d7a7926b49086b509058c62c9718cddf20168dbbb3e4b08c0067fa98
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a high number of external links, many of which are to S3 buckets, suggesting a link farm or SEO poisoning attempt. The presence of a 'download button' heuristic and a critical ClamAV detection for 'Pdf.Phishing.Trojan' indicates a malicious intent to trick users into downloading further malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jacksth.ru/123?utm_term=top+praise+and+worship+songs+2021 PDF link annotation
    • https://cdn.sqhk.co/pugirunosamo/KDadBhi/10740117492.pdfIn PDF document text
    • https://cdn.sqhk.co/lazogapuvo/mhaiejb/ecology_auto_parts_energy_way_chula_vista_ca.pdfIn PDF document text
    • https://geduwitanezuter.weebly.com/uploads/1/3/0/7/130738684/tujozefuxopeda_dipadagodaderem_najezolukex_fovinorax.pdfIn PDF document text
    • https://salewuso.weebly.com/uploads/1/3/1/3/131379029/palilepezoro.pdfIn PDF document text
    • https://cdn.sqhk.co/numokafas/jbrgvjb/68229579778.pdfIn PDF document text
    • https://xuvuvigaxopezut.weebly.com/uploads/1/3/4/7/134721928/zavizevafudalamulal.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/tasufagijaremo/36700743563.pdfIn PDF document text
    • https://s3.amazonaws.com/xenavuxa/roman_catholic_bible_in_english.pdfIn PDF document text
    • https://s3.amazonaws.com/samopakamefap/jewezijobowofu.pdfIn PDF document text
    • https://s3.amazonaws.com/zagubip/3625253354.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/bejelowig.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/reporting_independent_t_test_results.pdfIn PDF document text
    • https://s3.amazonaws.com/xepululejiwof/chrysler_pacifica_2019_owners_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/bulalowisu/ferimifuworup.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/the_beloved_charioteer_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/suzezanobikimisigaxibug.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/complete_pet_teacher_s_book.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_off0000f907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF907 5264 bytes
SHA-256: 135db2eaa0c0b269e0e42f6d5f1143cf6965bdb46be6acbbbff9c91d5b328347
font_01_sfnt_off00010ae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE9 12280 bytes
SHA-256: a681660fff5513996942bde071f2259535d1b5ffc9aaa41340ca3ffd369da2ef
font_02_sfnt_off0001337b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1337B 16236 bytes
SHA-256: 6b2e662b87874d3aa5a7f2e63b23189f11fd0cbde2ac78f3f9edb1ca3153b68b
font_03_sfnt_off000148fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148FA 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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