Malicious PDF — malware analysis report

Static analysis result for SHA-256 63818e5b676df7e3…

MALICIOUS

PDF

92.4 KB Created: 2021-02-24 20:13:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0fe26d43e4690906c305e58b5deb77ea SHA-1: 81f0a82c1445d3992b483ecd0fd36eddd6d3239c SHA-256: 63818e5b676df7e329b664c80264a45446f1f64296047e52b99ddb85e88192c3
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs that host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/aws?utm_term=skyrim+words+of+power+console+commands In PDF document text
    • http://figimumagoko.mygamesonline.org/72400232838.pdfIn PDF document text
    • http://ramosojakapo.iblogger.org/3543681281.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476282/normal_601ffeb12e362.pdfIn PDF document text
    • http://iuts.space/canopus_advc_300_manuale_italianosd23r.pdfIn PDF document text
    • http://lololoj.sportsontheweb.net/holt_geometry_chapter_7_test_form_a_answer_key.pdfIn PDF document text
    • https://rusaxexuratibu.weebly.com/uploads/1/3/2/6/132680860/50cdd14.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446283/normal_5fc6a605ab285.pdfIn PDF document text
    • http://legko.travel/what_are_3_facts_about_the_declaration_of_independenceub1sh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386828/normal_5ff17c7d1a3f6.pdfIn PDF document text
    • http://zonerokemub.getenjoyment.net/storyboard_pro_free_trial.pdfIn PDF document text
    • http://whalesqpa.fun/drug_dealer_mod_sims_4mq8i2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409394/normal_60281549d7488.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://bawibas.rf.gd/pebatex.pdfIn PDF document text
    • http://dafudezukixoz.epizy.com/tobiwofod.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10139 8676 bytes
SHA-256: 89274191f63b2909a3db6b30e551f2e11bea267062392ae6cb7151b06d249dfa
font_01_sfnt_off00011e31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E31 5368 bytes
SHA-256: b66377f4fd9942aef0b7125c2809816be4fb499011f209c3e8d0b0483c26aec5
font_02_sfnt_off00013068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13068 11104 bytes
SHA-256: 629c217a39184acfbdb99b32cbec0a1501c7a3ae01b4ff48ef6e56a963103fca
font_03_sfnt_off000155a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155A3 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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