Malicious PDF — malware analysis report

Static analysis result for SHA-256 61850d1f38b57d22…

MALICIOUS

PDF

71.9 KB Created: 2020-12-17 11:33:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 43aeffaff4a378af0f97742bb41b1d2c SHA-1: 19f2eef3d706bd03a6912507098ee422246de4f0 SHA-256: 61850d1f38b57d22bf6a1a8303bf4432b832840d0cddc0169aed4284182c27a3
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM'. The primary malicious URL identified is traffset.ru, which is likely used for phishing or to redirect to further malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffset.ru/123?utm_term=clementine+von+radics PDF link annotation
    • https://rifijilaguselud.weebly.com/uploads/1/3/4/8/134846829/nixopavurexibulazo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494669/normal_5fadaaab2c290.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444369/normal_5fa93671aba15.pdfIn PDF document text
    • https://fumewalifo.weebly.com/uploads/1/3/4/8/134884483/5089875.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/2e52dccf-9115-479e-bbd9-61d4b831c493/discografia_de_pato_c.pdfIn PDF document text
    • https://s3.amazonaws.com/votawawo/foto_bewerken_app_android.pdfIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/34244786052.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc123e317e7202640ebafce/t/5fc775abad3e641192477687/1606907308169/67326594853.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc72ed1504bb4653ce3fe21/t/5fc9c2ca81b71b408595c1f5/1607058123012/is_starlink_free.pdfIn PDF document text
    • https://s3.amazonaws.com/rivazixexuguri/implicit_instantiation_of_undefined_template_std_basic_string.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cbca2a3-ef8f-4b0a-bfd9-3ec16154914e/orange_county_cross_country_championships.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8749303-0a5b-4cd4-b977-a7c28db377ad/lake_camanche_south_shore_marina.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cec614d8-9073-4612-b8ef-3e0e762cabd2/finders_flea_market_decatur_il.pdfIn PDF document text
    • https://s3.amazonaws.com/vovabagubajegeb/aged_receivables_summary_report_myob.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c93d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC93D 5048 bytes
SHA-256: dbe78d263e8cd9140e84ced7032a839c82b7c18e4d2ad5b896bccbee8d96722a
font_01_sfnt_off0000da50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA50 10132 bytes
SHA-256: b9565a4764fca69377b111a061e046ccac1b59cc5ce168a9d144a2ce0f15949d
font_02_sfnt_off0000fd49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD49 16216 bytes
SHA-256: 5cb4188777f33cd410073f8b9d14bcb5a62f3956273c75e1cc66e568e6902af1

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