Malicious PDF — malware analysis report

Static analysis result for SHA-256 663f0e365d5cae5f…

MALICIOUS

PDF

83.8 KB Created: 2021-03-17 19:29:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f18c66ff246c74cdf684c165cd6322fa SHA-1: abc581055f36dbfe6c1dabb5c0c7078698bdc641 SHA-256: 663f0e365d5cae5f367923bd78c10d55e4dff41869c6828bf5a8096d3b0934a5
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://fokemale.ru/award?keyword=digital+logic+circuits+pdf+download PDF link annotation
    • http://xeresorejal.iblogger.org/lulujo.pdfIn PDF document text
    • http://japisonaxem.22web.org/aladdin_new_movie_songs.pdfIn PDF document text
    • https://buvapubadoloj.weebly.com/uploads/1/3/4/2/134265521/zepipow-bemipew.pdfIn PDF document text
    • https://putomusozozor.weebly.com/uploads/1/3/4/3/134321488/seven-wopulemo.pdfIn PDF document text
    • https://jipuziloki.weebly.com/uploads/1/3/2/6/132695969/26c94d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a4baa31-3444-4390-b828-cfb7bbe77e01/tejorasuwabofi.pdfIn PDF document text
    • https://s3.amazonaws.com/fewunadupop/13826263304.pdfIn PDF document text
    • http://moferamobonar.epizy.com/m-audio_oxygen_25_4g_review.pdfIn PDF document text
    • http://dedamedasobime.epizy.com/always_on_time_song.pdfIn PDF document text
    • https://s3.amazonaws.com/wovugi/gastrointestinal_hemorrhage_treatment_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78ad7895-ce67-4ed3-885d-fc7c577a4278/83372692900.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f55607f-6518-4de3-a407-e14516fa5398/actividades_de_escritura_para_segundo_grado_de_preescolar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d21daf5-7448-4cc9-9712-7e33405bcbf5/xitepokumafuri.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/blank_skeleton_diagram_worksheet.pdfIn PDF document text
    • https://7c2a7e5f-de2f-4207-b822-d971188c697e.filesusr.com/ugd/17f605_c3187096b3f64a8180558f12c37c1854.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/945e56a6-30be-48c3-8397-b022c63f9e41/without_remorse_audiobook_download.pdfIn PDF document text
    • https://29474179-7c7c-44ae-84e0-3c37792f2e25.filesusr.com/ugd/7f817d_89fc015e1a69424ebdb698654f28058d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a94d3010-8a1b-4631-9435-4bbd591a15fe/kelikebeduri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcea4bf5-4dbd-45f2-a30d-dda37f2e159d/hamlet_act_2_scene_2_soliloquy_translation.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_off0001097b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097B 5416 bytes
SHA-256: e02c55f9c2006348ba8392524265ecbd0ea0cbf47ab5bf8ccdcb78be3cdafb29
font_01_sfnt_off00011c13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C13 11024 bytes
SHA-256: d6a7f97816bf92976af8b9170a574df2c2011cf693e5a11b1d0dcf81b047332a