Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a0a1ba64333457c…

MALICIOUS

PDF

98.3 KB Created: 2021-03-08 04:31:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 37d06390f4f15062bd75efa2c3927a6f SHA-1: 22ebe4b377dd2ee89ee4133f5c0a92b32aea0608 SHA-256: 2a0a1ba64333457cd165777b6cddb0f0f0a7b1168dd2f579cf3f122ee127b177
156 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 0.9997

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://jacksth.ru/strik?utm_term=love+story+uke+chords+easy PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402938/normal_60152c4532af6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403271/normal_60211584277a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485173/normal_6044640e5f27d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408483/normal_6026fe187fd91.pdfIn PDF document text
    • https://sanufelileme.weebly.com/uploads/1/3/0/7/130775971/d26e33acc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461516/normal_603f08369fda5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392218/normal_5fcd752886b33.pdfIn PDF document text
    • https://jolefopasovoja.weebly.com/uploads/1/3/4/4/134402584/7adb48848e7d1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455670/normal_5ff5b0ce41314.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381098/normal_60456f4e3a330.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407813/normal_5ff9ca05465f8.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/fasudikek/why_does_my_eye_keep_breaking_blood_vessels.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c32925b-c33f-415c-b50f-453b48db6b0a/realtek_hd_audio_manager_driver_update.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a5b1c26-b6c8-4758-9003-18a2502c9122/5th_grade_math_worksheets_with_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/womirofop/centre_parcs_woburn_map.pdfIn PDF document text
    • https://s3.amazonaws.com/gebukil/begin_again_3_korean_variety_show.pdfIn PDF document text
    • https://s3.amazonaws.com/kujesulad/lr_baggs_anthem_owners_manual.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_off00014519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14519 5160 bytes
SHA-256: 08d8b593301ca3af6520d486da0b619e336ee9033423485c1573d31b114b0509
font_01_sfnt_off000156b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156B4 11252 bytes
SHA-256: 3d02d641def9710521401ff1feb849938941dba550e407b13cca4d3e5000f103