Malicious PDF — malware analysis report

Static analysis result for SHA-256 f91ebd771287c260…

MALICIOUS

PDF

72.7 KB Created: 2021-06-14 04:20:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: d706ee64a455acfb9af86b705ba21812 SHA-1: d2e2942419aa44611a60aeb79d013ed215cc17cb SHA-256: f91ebd771287c26038d191533ea6b8e88976f63ffa1e2a4e87819f14d0786767
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, many pointing to disposable hosting and employing UTM parameters, suggesting a link farm designed to redirect users. The document body, though heavily obfuscated, contains references to 'Meteor garden season 1 episode 22' and authoring information indicating it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://catamma.ru/pbw?utm_term=meteor+garden+season+1+episode+22 PDF link annotation
    • https://fezakuji.weebly.com/uploads/1/3/4/4/134490841/bokijin_jagudulonudolax_ripuramar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412173/normal_601e4eae6bf64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427519/normal_601953de6a0e4.pdfIn PDF document text
    • https://bijigixeze.weebly.com/uploads/1/3/0/7/130739450/1306255.pdfIn PDF document text
    • https://zedaluridafam.weebly.com/uploads/1/3/4/4/134464222/retalizur_jujipabun_juzuxaxegor.pdfIn PDF document text
    • https://roluwisotem.weebly.com/uploads/1/3/4/3/134368144/rogosujako.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449779/normal_606c79094c147.pdfIn PDF document text
    • https://sezokifor.weebly.com/uploads/1/3/4/5/134596047/zozakosilatot-keperutisipog.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/313e34b2-98c7-4b69-b284-bcaee374979f/how_to_clear_memory_on_omron_blood_pressure_monitor_bp652.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4efd19fe-1e11-4188-8426-99671c7967f1/d-link_dir-615_technical_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be9b5a21-e173-4984-8e60-88f08e56f21c/55177842221.pdfIn PDF document text
    • http://ditidema.pbworks.com/w/file/fetch/144905853/buxekepopu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3a0707f-54e4-406b-986e-714d27bb334b/sevefokanemelukowakida.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92a0b981-2acb-443f-9c38-c42f26d398fa/what_is_meant_by_autonomy_definition.pdfIn PDF document text
    • http://gitixofipoxu.pbworks.com/w/file/fetch/144602967/gesogidavulumuduk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60eaa2f1-9e39-453d-a1d8-73148f5c5696/67234472764.pdfIn PDF document text
    • http://gijorugisaw.pbworks.com/w/file/fetch/144674217/81609176137.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_off0000ded9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED9 5284 bytes
SHA-256: 51624a4911088de9b3153ea77838f36862e6b2ee6b6d47c390858970a048439d
font_01_sfnt_off0000f0f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F3 10944 bytes
SHA-256: dd5a9bb8b7cce3ef4b8b47006525bb9a50346803f64f2677f30e2ad10630b4f1

Open this report in the interactive analyzer, or submit your own file for analysis.