Malicious PDF — malware analysis report

Static analysis result for SHA-256 15d6ef2bcee1831a…

MALICIOUS

PDF

99.3 KB Created: 2021-05-10 04:28:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 996340cf7fba4afa581fd1f18d1abcbc SHA-1: cca7c8cd8f17876d62ddcccbdd5006ad6c087ae1 SHA-256: 15d6ef2bcee1831afb6f998813f76f55e8ff00d3669a1fe3a5c7673735fcc7a2
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting it's part of a link farm designed to direct users to potentially malicious sites. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://mezovuduw.ru/strik?utm_term=brandsmart+north+kendall+drive+miami+fl PDF link annotation
    • https://janodapos.weebly.com/uploads/1/3/1/6/131636969/robefivaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487200/normal_60369bdbd7e54.pdfIn PDF document text
    • https://momigetufi.weebly.com/uploads/1/3/4/8/134876151/nijafezax_gedovedulemugi_zolefajamife_jogelo.pdfIn PDF document text
    • https://fubewewafipox.weebly.com/uploads/1/3/0/8/130874235/levowika-mobapupoluza-bukesikekiro-dumov.pdfIn PDF document text
    • https://tumupapixukuju.weebly.com/uploads/1/3/4/8/134852222/bc0d7727381.pdfIn PDF document text
    • http://arendaavto.taxi/how_to_find_your_passion_worksheetgqea6.pdfIn PDF document text
    • http://crubr.space/53006882560ho73x.pdfIn PDF document text
    • http://free-at.pro/15239823904pbwk8.pdfIn PDF document text
    • http://wwnews.site/firefox_old_version_for_linuxkb4od.pdfIn PDF document text
    • https://gasodugolulo.weebly.com/uploads/1/3/4/3/134375537/mirad.pdfIn PDF document text
    • http://creamspait.xyz/bifubidukurxagcz.pdfIn PDF document text
    • http://verifiedbadge-lnstagram.com/suara_burung_walet_malaysiacfake.pdfIn PDF document text
    • http://superheatbelt.xyz/56695683328yq8h8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411483/normal_5ff53381d9158.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/9a70ae10-903b-48e2-b3df-b50b916ccda8/garmin_vivofit_3_gabrielle_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58ab04ab-8e02-40cf-9699-3d70200e08d5/stack_on_gun_safe_lock_problems.pdfIn PDF document text
    • https://7980b0ff-2efe-48f4-a442-6c87bca80713.filesusr.com/ugd/9bd8c3_416a1863a4ab48c991d28f5a9c1224e5.pdf?index=trueIn PDF document text
    • https://6739ca04-605d-4ff4-b4c9-4e5bd75a7819.filesusr.com/ugd/031dda_388ba4baba584796a2237092e0754164.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/97c87df7-c5b9-4c64-b866-bf0f8f819e0d/gitowik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/454f46aa-04e7-460a-ae8f-58064344d0f6/pioneer_vsx_820_setup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7b79c6e-c549-4e7e-a22e-b5fba10024bd/fasuzirosirekesinirut.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_off000143cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143CC 5320 bytes
SHA-256: d633a5db73d35d8c116c118e1feebe82cc00be2ab2db6fe0b5ce3f75266ab747
font_01_sfnt_off000155bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155BC 12356 bytes
SHA-256: 9b3c391900e00a9a202088a0673f644a88c56a21a7c6ffd5d51e73d594112386