Malicious PDF — malware analysis report

Static analysis result for SHA-256 88bce6617bef6365…

MALICIOUS

PDF

71.6 KB Created: 2021-03-25 00:23:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 715b28de9fbe5d8d4d5a6c74d910c3eb SHA-1: 703e31b45ee9d1733397608f08ca9918ccee7d25 SHA-256: 88bce6617bef636500519b7b50d07cb72b3f482ae545e62c20a3cd83fe828b48
186 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as containing a large number of external links, indicative of a link farm or SEO manipulation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the presence of numerous external URLs points towards a mechanism for delivering secondary payloads or redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://druttle.ru/award?keyword=numbers+1+100+worksheets+for+kindergarten+pdf PDF link annotation
    • https://cdn.sqhk.co/jobasalem/Mb1Ztic/67663586332.pdfIn PDF document text
    • http://yoga-fitness.space/how_to_make_simple_syrup_for_alcoholic_drinks1hx5g.pdfIn PDF document text
    • https://cdn.sqhk.co/retobumoki/awV7djb/86198822427.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450003/normal_6004b6e318680.pdfIn PDF document text
    • https://befugusugub.weebly.com/uploads/1/3/2/6/132683140/c5dc398476d3.pdfIn PDF document text
    • http://kukushka.space/vocabulary_words_synonyms_and_antonymsl0ccb.pdfIn PDF document text
    • http://fsbsiod.com/bowakigomolkpfjm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469126/normal_6044674a1691e.pdfIn PDF document text
    • https://gerasulas.weebly.com/uploads/1/3/4/8/134861388/7945342.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/Gijjhq7/vepoxonojimugapotap.pdfIn PDF document text
    • https://cdn.sqhk.co/bamazaludez/iephajh/32575541031.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/hhjdhid/43068504625.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410983/normal_60095d15af845.pdfIn PDF document text
    • https://dixuxizexejo.weebly.com/uploads/1/3/0/7/130740209/85f6809e80206d2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381976/normal_5fee898509480.pdfIn PDF document text
    • https://cdn.sqhk.co/xusikeko/ihFggig/when_does_joplin_mall_open.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421776/normal_601de7bd4419c.pdfIn PDF document text
    • https://cdn.sqhk.co/madumubo/gjjgghb/34422286313.pdfIn PDF document text
    • https://xevibobi.weebly.com/uploads/1/3/4/6/134683071/febita.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386618/normal_5fe81fb8d973e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370266/normal_6016445c22319.pdfIn PDF document text
    • https://cdn.sqhk.co/jugemito/ShaYiih/dunap.pdfIn PDF document text
    • http://raisinslabs.club/cobalt_service_airbag_messagepqycp.pdfIn PDF document text
    • http://ouily.xyz/zenurolafawilijaxunu5ufaf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F9 5884 bytes
SHA-256: eb7bc0fb54e9dee36aa6bcc7200fe3afa1a7e167f8f54490a3bd3a24143888db
font_01_sfnt_off0000ebf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF0 10220 bytes
SHA-256: bb7eca0abc87b0867257ea77f19b5cbde5c823fdeba49d3d540d2e2232e5d2df