Malicious PDF — malware analysis report

Static analysis result for SHA-256 91ee80f75402a251…

MALICIOUS

PDF

81.3 KB Created: 2021-03-18 15:37:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 522e12f54ed48a681ecc3e2ca1695307 SHA-1: 245daf2bc230702e4652a171b3f8005c4e0486e7 SHA-256: 91ee80f75402a251522cff5d504e74dc95847d89924de37b3e6c662e746b4bb4
186 Risk Score

Malware Insights

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

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 0.9992

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://baarspo.ru/wix?keyword=bodies+of+water+that+border+new+jersey PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4497658/normal_5fdc2c4b3f64d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450733/normal_60506625f3826.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453553/normal_5fcf78f07931a.pdfIn PDF document text
    • https://cdn.sqhk.co/bitowiso/3hiCNgc/34719438743.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409796/normal_604d0b7def0a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373769/normal_5fd7d0434f00e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369516/normal_6009e6acedbfe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385427/normal_6031b521c18c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464078/normal_602234102d4ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419637/normal_6019ddbf25e0a.pdfIn PDF document text
    • https://cdn.sqhk.co/livukigelo/ieDijJn/escape_planet_earth_soundtrack.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://cb6d8354-940b-4e05-9f1d-0150973ab277.filesusr.com/ugd/882da0_d3a5494c9e0e4a66872d743d7876acdb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/36620f3c-d6e8-4f9e-abe6-9d531e9991be/iso_31000_training.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28673eed-77ce-4fec-8722-81d3177fd29d/62043381418.pdfIn PDF document text
    • https://1d942ef5-affb-47d8-8f99-70a3d187b733.filesusr.com/ugd/3283b0_f5bce6d5be274f4b8957baba74cd9362.pdf?index=trueIn PDF document text
    • https://899154e9-876a-4ab4-94d5-c8ef2aed10f2.filesusr.com/ugd/dcf9ad_6385cd5e097b4388be43293e542b97f5.pdf?index=trueIn PDF document text
    • https://7c5e2310-e79b-429e-9f4a-70471a43dcce.filesusr.com/ugd/8ec1ef_e399ba7dc80542618578443e37bf927d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c1b10e6-82e7-4159-8200-02231c8ecee0/microsoft_word_printing_document_properties.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e6abea2-eeeb-4034-86ed-d09545f72d8c/41874881326.pdfIn PDF document text
    • https://3c86e5df-9a55-47dd-9d5b-c207b25ec6cd.filesusr.com/ugd/72bf36_56e4df9b2d44456584d79efcf5980c83.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e9b1de7-fa0e-4e11-8bb9-ad5384a5191b/the_road_not_taken_plot_summary.pdfIn PDF document text
    • https://1c514d3f-4aca-4c14-a2cc-94ef866bc6c7.filesusr.com/ugd/860217_7957006681064c76af957af4621101ea.pdf?index=trueIn PDF document text
    • https://ba789de2-c385-43ee-b32d-a34c698d1993.filesusr.com/ugd/b7082a_79719511e8ef43f1adf885ca16ca4cd3.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF424 5212 bytes
SHA-256: b2208f0df99c0e6b3c307a43ba961c3fe4f6d89da04314408b01b0abb551609b
font_01_sfnt_off000105ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EC 10416 bytes
SHA-256: 31a48e13443ce043377365bb02f3b505551b97a28834baaa4ab507c84d30ec11
font_02_sfnt_off00012975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12975 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71