Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba8bfadeff750c7a…

MALICIOUS

PDF

69.9 KB Created: 2020-12-19 18:39:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 46f8ba0f71e5376fb95f935a2dc976e3 SHA-1: 9dc5d0156d2f8a7d32421e98fa034acc4527bb58 SHA-256: ba8bfadeff750c7a1426df4c29bfe99e99337ef3052958f7fc34c8d991530a5b
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with the primary URL leading to a link farm disguised as a dictionary search. This is supported by the 'PDF_SEO_LINK_FARM' heuristic firing, indicating a mass of external links. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or ad fraud.

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://trafficel.ru/aws?utm_term=synonym+antonym+dictionary+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4445889/normal_5fb724c5b35fe.pdfIn PDF document text
    • https://falufanimuv.weebly.com/uploads/1/3/4/3/134377488/vafiwodetuzepirovil.pdfIn PDF document text
    • https://sukuwakutas.weebly.com/uploads/1/3/4/6/134603616/9051721.pdfIn PDF document text
    • https://sukizasatesez.weebly.com/uploads/1/3/4/6/134686833/goniwemirud.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470826/normal_5fdda4484f8b7.pdfIn PDF document text
    • https://gojenegitoz.weebly.com/uploads/1/3/4/3/134387591/cd29c72966df35.pdfIn PDF document text
    • https://bomejafir.weebly.com/uploads/1/3/4/7/134725936/pegumerirupexaraf.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/potamotaz/psx_emulator_with_plugins_and_bios.pdfIn PDF document text
    • https://s3.amazonaws.com/rolefosiju/best_photo_editor_pc_software.pdfIn PDF document text
    • https://s3.amazonaws.com/gotitibekovi/duziberijofaroli.pdfIn PDF document text
    • https://s3.amazonaws.com/zagapaxa/gubbi_mele_brahmastra_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/sitozi/work_progress_report_template_ppt.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdcba3c92f0e27cb84b8f30/t/5fdcfb6fed5d2a1bbdf434f9/1608317807992/70110077633.pdfIn PDF document text
    • https://s3.amazonaws.com/wixatax/informative_advertising_examples_for_students.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_off0000d364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD364 5296 bytes
SHA-256: d0d716b2a9c498b69b5889879f0443982fea8e8716d95243f4fed0187f6b9b93
font_01_sfnt_off0000e55e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55E 11328 bytes
SHA-256: 4f098ad75d7d19d202d691cf721b77f27b4cb9d72fc19be7ecbcd05ba18ec0b4

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