Malicious PDF — malware analysis report

Static analysis result for SHA-256 a49e8d6474c7c950…

MALICIOUS

PDF

77.6 KB Created: 2021-03-17 04:03:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 8761659d17f4e2da064d7e0c0b55bba0 SHA-1: 41a0ef467145637fe1ebe8d5a368eadc08ef2e68 SHA-256: a49e8d6474c7c950791658fa9452e6f795ddbded7b0338bff936404ce24451da
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, as indicated by the PDF_SEO_LINK_FARM heuristic. One of these links, https://botokaw.ru/strik?utm_term=how+tall+is+aj+lapray+in+feet, is flagged as an external URI. The ML classifier and ClamAV also identified this PDF as malicious, suggesting a phishing or malicious content delivery intent. No scripts were extracted, but the sheer volume of links points towards a malicious campaign.

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://botokaw.ru/strik?utm_term=how+tall+is+aj+lapray+in+feet PDF link annotation
    • http://stonersfranchise.com/29975164050eusyc.pdfIn PDF document text
    • https://betufevu.weebly.com/uploads/1/3/4/0/134098732/sufurura-mifegepefize.pdfIn PDF document text
    • http://organicsss.space/agent_ransack_download_macy6l46.pdfIn PDF document text
    • https://guditeni.weebly.com/uploads/1/3/4/5/134529862/a9bfd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/pigeje.pdfIn PDF document text
    • https://a98f38e8-5810-4fc9-be6a-c3d78c7c4f9f.filesusr.com/ugd/921909_bae2351b2e0344b5a8b6c38c2a3dc64e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/defujo/borg_warner_t10_rebuild_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wujafivabipo/8879439758.pdfIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/moxububezigazifepotot.pdfIn PDF document text
    • https://5f384421-c3d0-4b4c-85a6-d3745974446f.filesusr.com/ugd/40006b_8ae67efab67644979ffec0bc898b4191.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/miledu/microsoft_project_viewer_freeware.pdfIn PDF document text
    • https://s3.amazonaws.com/muvazi/97469065604.pdfIn PDF document text
    • https://s3.amazonaws.com/pafexegud/cycleops_trainer_instructions.pdfIn PDF document text
    • https://3c86e5df-9a55-47dd-9d5b-c207b25ec6cd.filesusr.com/ugd/72bf36_c1e611466b9a4fb29d7c174ba3eb77ff.pdf?index=trueIn PDF document text
    • https://ae8c1479-5121-4009-b0ed-8259dbb1205b.filesusr.com/ugd/0aff45_7ee3ba315e8c4a46b454be27cdbcdac0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jujojomojemiz/66278101832.pdfIn PDF document text
    • https://s3.amazonaws.com/tobojelusiwi/lowrance_x49_power_cable.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/lesabefudetenotiketute.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/can_i_join_delta_sigma_theta.pdfIn PDF document text
    • https://da99f664-88c7-4a27-98aa-0bbcec2e8f57.filesusr.com/ugd/66f3f9_bd8a0d303480417c82c3ac1db2ded424.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vufupu/citrix_receiver_update.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_off0000f051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF051 5124 bytes
SHA-256: df26882ccc2d538cf00d1dddc5491e61a0514c8353cc2bdc6139f3fb902cab40
font_01_sfnt_off000101e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E9 11508 bytes
SHA-256: 030ae5525afa0f5e569b6cefa828fbf90d48b00b8425877c60e3c5e258a4b6fe

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