Malicious PDF — malware analysis report

Static analysis result for SHA-256 83ebd24e02d426d8…

MALICIOUS

PDF

89.5 KB Created: 2021-03-15 15:28:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 281a2e4b22d524aea10c611326a7cdfe SHA-1: 15e498dd21abfd9e3098a58ed3d1102f3efd12a7 SHA-256: 83ebd24e02d426d8550adfd21b8c8102bf84f8f94e3ccb9d7648189b5c598945
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a clipboard-command (paste-and-run) lure. 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 0.9994

Heuristics 7

  • 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://jottigo.ru/award?keyword=adsl+router+configuration+pdf PDF link annotation
    • http://azorocheat5.xyz/itil_intermediate_service_operation_certification_cost_indiamw6oh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375700/normal_603d0c5a6f97f.pdfIn PDF document text
    • http://copyright-securityx.com/68701848334omhq9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465388/normal_6018e4b091ec1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443619/normal_6036f5a9b1407.pdfIn PDF document text
    • http://helplnstagramcontact6088756.com/what_is_the_mean_of_a_triangular_distributionmqxpu.pdfIn PDF document text
    • http://de-bewertung-id2842384.icu/pamokepelurazixip7f9vt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489061/normal_603b1cdd333c8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500877/normal_5ff9155682f79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426815/normal_5fd3db4533b23.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451363/normal_5ff9789e06662.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b860438a-ced3-4995-86f2-ad9a24e3f15c.filesusr.com/ugd/938eb2_748797c99876450a98006ee743cbfeab.pdf?index=trueIn PDF document text
    • https://75e6d08a-b14f-4c2c-bd4e-3e6431d9d11c.filesusr.com/ugd/497a87_5f7c547e08d54554b9479f8081614b9b.pdf?index=trueIn PDF document text
    • https://8ed6bd9f-de2b-4923-b7df-82f95eb18a03.filesusr.com/ugd/7fa32f_08ec1768b69a4460bff1d54a82c3e9c3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/liwara/bootstrap_4_rtl_template_free.pdfIn PDF document text
    • https://9005a25f-7293-4a73-bb0f-bc58e8c16807.filesusr.com/ugd/e3834b_8cdaee86a3a54b3f90ea9d27131a0850.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ribowexulo/expiry_date_reminder_in_excel_template.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/retail_area_manager_interview_questions_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/risiwokova.pdfIn PDF document text
    • https://78151a86-a557-4e49-81aa-a2539eea45c7.filesusr.com/ugd/204f4f_2f973b7b700d483e988cce4cbee86a7d.pdf?index=trueIn PDF document text
    • https://8cff94d3-ecab-4ea5-ad27-d3e67d02fd32.filesusr.com/ugd/2813e2_113feeb9b9b24588b37b73fe7861fa37.pdf?index=trueIn PDF document text
    • https://a44a9d9e-3ce9-422e-9b5d-83ef2d4925cb.filesusr.com/ugd/3234e9_eaff51dc4ef24dce84f52ff67f0daa74.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00013c54.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13C54 18368 bytes
SHA-256: ffa397d700e75684b5df7b76252eb5e05221dd362c9c1f51aa90de17fe00a551
font_00_sfnt_off000102d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D9 5312 bytes
SHA-256: c678f03b3603cf84c16c0b0fdda727558c599ce22d4b0b951828baee7544cdaf
font_01_sfnt_off000114fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FC 11564 bytes
SHA-256: 243041fc56a076cb2350a3bca1313e306bd846dd2be6c26ad52f9fe56195ada4