Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9de146b6993b86b…

MALICIOUS

PDF

76.8 KB Created: 2021-02-20 11:49:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1be64eb455173ca92642942596ec7862 SHA-1: 916dd75ce029907136aa7236321b143124361e60 SHA-256: f9de146b6993b86b7161daff343f521912519d5e49028b4583676102dfbfdf48
126 Risk Score

Malware Insights

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

The sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support the attack pattern of luring users to potentially harmful websites.

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://jottigo.ru/wix?keyword=namekian+dragon+ball+online+generations PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4498868/normal_5fdfac02577bc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414867/normal_5ff68833a5604.pdfIn PDF document text
    • http://fazojum.66ghz.com/wisiwosasutik.pdfIn PDF document text
    • https://cdn.sqhk.co/bilanogakiw/NgjiCib/my_idle_city.pdfIn PDF document text
    • https://cdn.sqhk.co/letiludixo/ijTq5ig/64280809263.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494166/normal_60228d1e0684c.pdfIn PDF document text
    • https://cdn.sqhk.co/wekaradukuve/IjdruV2/74593900925.pdfIn PDF document text
    • http://instapresent.site/3rd_grade_daily_language_reviewlzbna.pdfIn PDF document text
    • https://cdn.sqhk.co/katutilit/hmjPSwQ/likebep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481058/normal_601eaa768ffdd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417527/normal_600debf1c21bd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gobetenogal.rf.gd/cheap_irobot_vacuum_cleaner.pdfIn PDF document text
    • http://ropobowex.epizy.com/pipovagufi.pdfIn PDF document text
    • http://wubexemetaxoru.epizy.com/adobe_photoshop_latest_version_2019.pdfIn PDF document text
    • http://jozopon.rf.gd/mobile_video_call_app.pdfIn PDF document text
    • http://roposinifewex.rf.gd/91872025432.pdfIn PDF document text
    • http://gezixerigalejeb.rf.gd/dubai_car_accident_report_online.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF8 5300 bytes
SHA-256: e1d732f1f229972072f067609de697f944434dc3d3d952d02c10dabdf99d6b42
font_01_sfnt_off0000ee25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE25 5316 bytes
SHA-256: f935176189a252453b46b3ecd2f0c1e25d6e27db015dfc61c0de0be5fd5c5e42
font_02_sfnt_off00010027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10027 11096 bytes
SHA-256: 582cc692bdd956b400283e4e0863a7e7efc1797a15263766dd94213cee8f12c4

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