Malicious PDF — malware analysis report

Static analysis result for SHA-256 e77c3fb1c8b0afda…

MALICIOUS

PDF

76.1 KB Created: 2021-03-21 23:51:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: e1dcf3830b4121f000d199810786b864 SHA-1: 1586b4062f4845c7692c6a06c4893b990168b621 SHA-256: e77c3fb1c8b0afda210ab6b3cdeb25fa040e8493d128f96c2336427dcbf89769
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gimoguvi.ru/wix?keyword=diana+v.+california+board+of+education+%25281970%2529 PDF link annotation
    • http://bagomebefekixob.getenjoyment.net/xuzopusavimuwa.pdfIn PDF document text
    • https://zomafada.weebly.com/uploads/1/3/4/7/134772300/6001783d824e.pdfIn PDF document text
    • http://pakekoramiduwin.getenjoyment.net/curso_de_violo_completo_em.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415081/normal_5fd6127c88374.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473049/normal_5fe2457bd168e.pdfIn PDF document text
    • https://felonuwonab.weebly.com/uploads/1/3/0/8/130814100/laxonezo-diriderew.pdfIn PDF document text
    • https://sutukedepebovi.weebly.com/uploads/1/3/4/7/134753024/tovogimejubabiw.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/82b72279-ef95-465b-a95f-81a53f101fab/35863722733.pdfIn PDF document text
    • http://gevejonitu.onlinewebshop.net/98945409067.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c390e4db-34b3-46b6-9d96-ccfcb1b4575a/how_does_lpg_automatic_changeover_regulator_work.pdfIn PDF document text
    • http://bumerezuwo.epizy.com/22852904387.pdfIn PDF document text
    • http://domuromu.atwebpages.com/how_much_does_a_round_bale_of_hay_weigh.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddebab58-3e5a-46c7-83dc-006d9e07ab0f/examples_of_scientific_research_proposal_paper.pdfIn PDF document text
    • http://maligufaribez.epizy.com/firepower_2130_asa_datasheet.pdfIn PDF document text
    • http://girifej.epizy.com/kewegenewofarolojomuf.pdfIn PDF document text
    • http://deburukibovip.rf.gd/werapowogitujibevefonufel.pdfIn PDF document text
    • http://dilabopitomosif.epizy.com/97982998527.pdfIn PDF document text
    • http://mujunuge.rf.gd/81970132838.pdfIn PDF document text
    • http://jepisaf.epizy.com/29231170747.pdfIn PDF document text
    • http://voxinakono.rf.gd/cavatina_john_williams.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_off0000e9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EC 5652 bytes
SHA-256: bdc0e6e2d976db0147e1241214de76549368b07f0a8a52611a205a7338d53ec4
font_01_sfnt_off0000fd69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD69 11140 bytes
SHA-256: 8e8c7587181f1bb6017128b971b5e24c361d9d470a74fcef5359860d040d8ea7

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