Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a1396f53ee944b6…

MALICIOUS

PDF

73.8 KB Created: 2021-02-10 08:12:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 2a365440f3fcdab14d395b5be047bfc5 SHA-1: 0a883c6aa3d9030ab79a3003d3eb6ead7b0d3821 SHA-256: 6a1396f53ee944b6256704395efdfb52c535a5a9861fc43f498aa1c04a9ad1b2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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 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://maypoin.ru/aws?utm_term=format+factory+exe++filehippo PDF link annotation
    • http://cg-designer.xyz/skater_jeans_mens_asosooasf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402717/normal_5fe3133027040.pdfIn PDF document text
    • http://classicalnaturally.com/maths_short_tricks_bookr9rdv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413567/normal_5fd2de1ce93c4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422147/normal_6009932148809.pdfIn PDF document text
    • https://malegudupo.weebly.com/uploads/1/3/0/8/130813961/28dcea059.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393034/normal_60133b529f44c.pdfIn PDF document text
    • http://martans.space/oxford_accounting_dictionary1vbw5.pdfIn PDF document text
    • http://felidefewipikig.22web.org/android_java_model_class.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zebofazedixa.rf.gd/vector_dot_product.pdfIn PDF document text
    • http://zoratazux.epizy.com/66577444082.pdfIn PDF document text
    • http://vidabovon.epizy.com/la_casa_del_papel_soundtrack.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/garmin_bmw_motorrad_navigator_vi_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxagixil/conditional_0_exercises_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jidagafinuxesu/branched_oak_lake_fishing_report.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_off0000e429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE429 5204 bytes
SHA-256: 365b26a1e33930ccfc3eecd8a2e7fd3995b13a33bb60bb19ce166c2504af4e9a
font_01_sfnt_off0000f5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C1 10988 bytes
SHA-256: 19396a0f0deb878f27dc88b2dd2fc3d8bd755670806004a7807b7b332c4998bf