Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f8377efd74aa87d…

MALICIOUS

PDF

69.4 KB Created: 2021-03-27 18:53:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: b1c6fe8ec0e820292f8df1e98216eb7e SHA-1: d4688121bf651f7b3f8e26b3cd3618605ee69b0f SHA-256: 1f8377efd74aa87d8423f94f7a53b1e9c66862e385460b802c365e9b31570f04
126 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a non-clustered link farm on disposable hosting, further supporting a malicious intent to redirect users. While no scripts were explicitly extracted, the PDF structure and heuristics strongly suggest it's designed to lead users to malicious external sites.

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://druttle.ru/wix?keyword=ap+world+history+chapter+23+test+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366366/normal_600021590dd2a.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • http://termometr-medikal.site/can_i_use_android_apps_on_chromebook1tsql.pdfIn PDF document text
    • http://gojifenap.22web.org/20702486280.pdfIn PDF document text
    • http://fubawubu.22web.org/chrome_setup_offline.pdfIn PDF document text
    • http://luwazesoj.22web.org/88463290464.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367680/normal_5ffa3c380b197.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • http://kellys.space/92484336662ve07v.pdfIn PDF document text
    • http://getallcreditscores.info/private_tutoring_flyer_template9j0pm.pdfIn PDF document text
    • http://espaceabone.com/36048474617o2wcc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sikejilewiz.epizy.com/34778872816.pdfIn PDF document text
    • http://gugamofizuxeg.epizy.com/calculo_de_disoluciones_molaridad.pdfIn PDF document text
    • http://dinijeti.rf.gd/400883626.pdfIn PDF document text
    • https://ad0d0dbb-669b-46a9-85df-79487014a0f3.filesusr.com/ugd/00d95d_ff3fb2931a2f4cc4bd868967d8308186.pdf?index=trueIn PDF document text
    • https://5634f520-c25d-421d-ab67-3d94505d13cb.filesusr.com/ugd/1b85ab_26d14e1c50e640c2ba58b3b8d321a85d.pdf?index=trueIn PDF document text
    • http://bepunemafozo.epizy.com/telecharger_bescherelle_anglais_pour_tous.pdfIn PDF document text
    • http://wupepiritepax.epizy.com/rofudenulejilono.pdfIn PDF document text
    • http://golokelu.rf.gd/govol.pdfIn PDF document text
    • http://gajefeni.rf.gd/nitofef.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_off0000d12e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD12E 5640 bytes
SHA-256: 5aa6aeffef91b9e643748d05c3a85818c794005134061dc1575d9690f05a6405
font_01_sfnt_off0000e46d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46D 10472 bytes
SHA-256: a298381409dcfce6775a9df4650072776589fe39d2d470c71f59ca720ec78d76

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