Malicious PDF — malware analysis report

Static analysis result for SHA-256 49f3a02038a67be4…

MALICIOUS

PDF

83.0 KB Created: 2021-04-06 15:54:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6e11babe77851c56d32001b1fb3e25d5 SHA-1: 81e807ede089aa8f2d6267568fca3224cadbdfac SHA-256: 49f3a02038a67be4f3e41ebd9d4594ad035333d67cbc26a9b52085f0e8ffdbf2
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 0.9990

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://druttle.ru/123?utm_term=moonkin+pvp+guide+bfa PDF link annotation
    • http://iminn.ru/asus_z97_pro_gamer_cpu_support_list5t94k.pdfIn PDF document text
    • http://helplnstagramcontact5087423.com/download_wechat_for_pc_latest_versionwhkfk.pdfIn PDF document text
    • http://astrohelp.space/cambridge_medical_englishedpqx.pdfIn PDF document text
    • http://italywom.space/detox_program_for_weight_loss_in_nigeriat1f6o.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://748e6e98-33e2-4bd1-95aa-01ea3505a154.filesusr.com/ugd/704f6c_5132ae43f65f44ff8d1601a0b68db96d.pdf?index=trueIn PDF document text
    • https://377d1c6c-8747-407e-9a0d-bb8234813250.filesusr.com/ugd/f0b1fd_bf59659af3cb4c87a4efd05f04563259.pdf?index=trueIn PDF document text
    • https://9387bd13-3746-4408-b474-2867f26e464d.filesusr.com/ugd/ace02d_f1e9adebc75a412fb3f4084cf6b0cfdf.pdf?index=trueIn PDF document text
    • https://ab25a8b3-4d80-4d4b-93a1-c1347014fa7c.filesusr.com/ugd/8d0191_530d81bad7e24590a42419374766d79a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d385069-f068-448b-b546-3e3fa9bdcdf2/zojirushi_rice_cooker_made_in_thailand.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54aa6225-c513-47e2-a97e-5ac977815203/zifexarovik.pdfIn PDF document text
    • https://3c3713de-992c-4571-92b4-00afcb8cb2c1.filesusr.com/ugd/9dbdb2_2b170cc265ff407bb8110e4ae0a85a9e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pafexegud/pafofupodurikufejojupa.pdfIn PDF document text
    • https://557345b1-98c6-442d-b460-9e357c178e5b.filesusr.com/ugd/dfb5f8_f909c40b84e745dda01c9878ba2e5921.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/97e330ce-e981-48cc-9207-f3a90858a6e9/how_to_use_word_to_create_forms_fillable.pdfIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/congruent_triangles_worksheet_2_answers.pdfIn PDF document text
    • https://6843e3eb-5573-46e1-90a0-370cfc2b4a0d.filesusr.com/ugd/89b1bc_4a85dc03458b4aa89546a207faa4cb42.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/af3ef6d6-65ba-4bad-87bb-0a11f08b0080/87181330881.pdfIn PDF document text
    • https://ea74ff18-003d-4094-8454-8d7e15e33abb.filesusr.com/ugd/50de67_a95c0eac86d1498ba4756d3e37c4bd4f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/498a333b-ba02-4677-883b-2676623b9bc6/one_of_us_is_lying_book_cover.pdfIn PDF document text
    • https://a1f0096d-76f5-425c-b826-5ccbd312c1bc.filesusr.com/ugd/8f8c07_595b4241e1c84b53975d6619547424ff.pdf?index=trueIn PDF document text
    • https://e905e09d-7ddd-4aab-833c-73500e817873.filesusr.com/ugd/f4c08b_acfad614879e4f888d3fb17168a34a75.pdf?index=trueIn PDF document text
    • https://7aff118d-26f6-4d76-9bc9-1838009e7274.filesusr.com/ugd/f80014_5d423910f54f4e608e9198b3c32c367e.pdf?index=trueIn PDF document text
    • https://d6b7b3c7-8429-4d82-9d75-5d5d09e763cc.filesusr.com/ugd/a8c229_ccc467c0b4464a3fb6b9a9065453d73c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/95327661130.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_off0000ef41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF41 5172 bytes
SHA-256: a5d70e17023df7a0beb134667bec79ea1933dae9065ba1632d21907246efbff9
font_01_sfnt_off0001010c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010C 11628 bytes
SHA-256: dfcc301c54345a58b97b1bfedf3693524015c97d598eb895d0c5d85962548fc5
font_02_sfnt_off0001291b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1291B 16152 bytes
SHA-256: 4e9d3221fd6cec411b0ba19547749661ae58a8d52741f984e890449f03bc0e66