Malicious PDF — malware analysis report

Static analysis result for SHA-256 304739aa6fc281e9…

MALICIOUS

PDF

70.2 KB Created: 2021-03-24 07:50:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 22041f175f8234e1f042fb523134460b SHA-1: f02dca978fc02476bcefc4a590f4253960ea2e77 SHA-256: 304739aa6fc281e9f50c73807555ba129bd6ebcd4a95bc37b32f1734df2308bb
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, suggests a lure related to English grammar exercises. Numerous external URLs are embedded, pointing to disposable hosting and link farms, which are common tactics for phishing or malware distribution. The presence of external URIs and the overall structure strongly suggest this PDF is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/award?keyword=czasy+perfect+angielski+%25C4%2587wiczenia+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4500200/normal_600f62ee9aa6d.pdfIn PDF document text
    • http://bexukavinawexov.mygamesonline.org/katatubafegodojubax.pdfIn PDF document text
    • http://wifunagidoli.mypressonline.com/usmle_step_1_scores_percentile.pdfIn PDF document text
    • http://rogijowop.sportsontheweb.net/tukijulaxu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368242/normal_5fc888c09ea86.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369328/normal_5fded19569daa.pdfIn PDF document text
    • https://cdn.sqhk.co/metexemoraga/qgjghgK/1269839108.pdfIn PDF document text
    • https://cdn.sqhk.co/vizoxaxijojo/ehaLjhM/97623258692.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448976/normal_602b52ceaf013.pdfIn PDF document text
    • https://cdn.sqhk.co/gabadifofibo/xhjcijh/shareit_app_download_jio_phone_me.pdfIn PDF document text
    • https://cdn.sqhk.co/xubuzivo/djgoM42/solid_converter_full.pdfIn PDF document text
    • https://cdn.sqhk.co/vetelojid/hcVgghi/minecraft_servers_hypixel_bedrock.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478932/normal_60114a4704595.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416153/normal_5fe9b6aea051b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416504/normal_5ff9c3a77b76b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379220/normal_5ff97aafa942e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zepukedosapiw.rf.gd/watejaretekuses.pdfIn PDF document text
    • http://donofetesexok.rf.gd/viral_conjunctivitis_patient_information.pdfIn PDF document text
    • http://figigibole.rf.gd/firefufenabonovasejexaro.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_off0000d225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD225 5672 bytes
SHA-256: 7d866bdbf42c4ef280a63655d4dd567f1d525a761a9128582cbf979662fbe205
font_01_sfnt_off0000e55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55D 11204 bytes
SHA-256: cce7d4b0f842322eae71647db59031f4005305ef674be251fbf587dcc2b9534a

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