Malicious PDF — malware analysis report

Static analysis result for SHA-256 131dcc997a1ff3b6…

MALICIOUS

PDF

113.1 KB Created: 2021-03-17 05:49:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a8818a5b97319b1fc748f02a73e977ee SHA-1: b664447d79ff4b85f176b9bc32613417e8bad125 SHA-256: 131dcc997a1ff3b6b1698642f789509f1ec36053e79ac946696acc5d845ea6cf
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 0.9987

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://jumiwimov.ru/strik?utm_term=neverending+story+got7+lyrics+english PDF link annotation
    • http://soldonlakewood.com/what_are_the_steps_in_lean_six_sigmanrx39.pdfIn PDF document text
    • https://vofovolovun.weebly.com/uploads/1/3/1/4/131483423/fasolajuparofir_pilegewepevutu_zawerinol_jikaga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476268/normal_5fe9dd2a25ed3.pdfIn PDF document text
    • http://rezonansmusic.com/tadawobimetepowilub72gvm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366627/normal_602ff37fb270c.pdfIn PDF document text
    • http://sputnews.com/thande_ki_botal_dj_mein8rflr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370278/normal_601b73796e98d.pdfIn PDF document text
    • https://tebadigizowi.weebly.com/uploads/1/3/4/1/134109241/6e69adf968.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412396/normal_5fcc6fb2ddfd6.pdfIn PDF document text
    • https://lajexupizad.weebly.com/uploads/1/3/0/7/130775806/7066535.pdfIn PDF document text
    • https://danikobunib.weebly.com/uploads/1/3/4/7/134755608/85d042604fca.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4b523d79-2bc6-404f-8e52-0acae4d2cb03.filesusr.com/ugd/fe1b41_ccdf0effdeeb4b2382c900e7ee66081d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fca971b7-a269-464e-a0d4-46cf5d77cb9a/performance_review_sample_for_employees.pdfIn PDF document text
    • https://d0fd53c2-66a5-49f7-a942-a4bfc50892a3.filesusr.com/ugd/11baf9_1e9cc07b80fc4aa88aa84b250bbec95c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/241cc884-abec-407b-83b0-576c664652bf/letofefelogixokakite.pdfIn PDF document text
    • https://s3.amazonaws.com/bofake/acute_pharyngitis_nice_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/farefasejikap/handy_stitch_handheld_sewing_machine_review.pdfIn PDF document text
    • https://0e627107-309b-4451-a84d-e7064c41fccd.filesusr.com/ugd/04c368_45bfba968d034316bbebb2a5eb3a17a8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cffc0915-84c2-4164-8fd5-796f9bd7e592/how_do_i_reset_my_skytech_fireplace_remote.pdfIn PDF document text
    • https://aa4c2489-c93b-4667-afab-104bf5323bad.filesusr.com/ugd/8b49c6_1bfdecfeae3046d3b12be60159ee6601.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/apa_bibliography_format_newspaper.pdfIn PDF document text
    • https://883cd1dc-02d0-4059-8fa2-99201f92b631.filesusr.com/ugd/6166c9_a5f42a87e6594d349bd003810ed6c10a.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CB 43744 bytes
SHA-256: 3cc921c209de6cd1258e774c51468e8c816e09281f0c473d83de3058c15584bd
font_01_sfnt_off000175a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175A0 5204 bytes
SHA-256: f4eef8e22a820a032d497c5eedfb6ccc8cdf083f48d092d188e960aa973d5704
font_02_sfnt_off00018764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18764 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_03_sfnt_off00018ff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18FF2 11240 bytes
SHA-256: 613c6639e80aa8025d5fed9ca807c9b4e96053aec868c0861e7fd8d54dd62cd7