Malicious PDF — malware analysis report

Static analysis result for SHA-256 478ec2fc1a0f866b…

MALICIOUS

PDF

117.5 KB Created: 2021-03-31 03:03:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 93ee0bd0c801a810d5071f02974bafcf SHA-1: b281769a1bbac17639f4351cd05d3ef3dab1ad3e SHA-256: 478ec2fc1a0f866b9bb5c82e8f0e6b5e5f5d8c250d962ae2f056e9e8b60b5f3c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://kuzutuzo.ru/wix?keyword=tv+guide+bryan+tx PDF link annotation
    • https://cdn.sqhk.co/mikedeto/zpueibK/16063491346.pdfIn PDF document text
    • https://cdn.sqhk.co/rivinodati/5hjAghp/weximigeguzezagoxefut.pdfIn PDF document text
    • https://cdn.sqhk.co/vadavenaw/jageiii/kutuzagutarizawenadixojep.pdfIn PDF document text
    • http://wurilozi.scienceontheweb.net/attacking_anxiety_and_depression_workbook.pdfIn PDF document text
    • https://cdn.sqhk.co/dugelabomaw/ggOjdi4/disneyland_hotel_paris_castle_club_upgrade.pdfIn PDF document text
    • https://cdn.sqhk.co/xaduwudixum/ppgdxjh/72638668443.pdfIn PDF document text
    • https://nasovakuj.weebly.com/uploads/1/3/2/3/132303133/fovetupobexemu.pdfIn PDF document text
    • http://vurovolapoza.mygamesonline.org/ledurirum.pdfIn PDF document text
    • https://mogatuzutixu.weebly.com/uploads/1/3/4/6/134684840/jizofazadono_luxodinum_xexameki_bonenabizewu.pdfIn PDF document text
    • http://wixujikubipom.mygamesonline.org/93187410415.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/43be3471-719b-43f6-b605-7d22fe9ec6b3/is_neuropsych_testing_covered_by_medicare.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8c1ab6b-56b3-467d-a383-a33b0a709825/first_alert_co400_expiration_date.pdfIn PDF document text
    • https://s3.amazonaws.com/mukutud/45499399348.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a7318a5-332d-4518-bd69-ba3c93ad57db/tezunexazido.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17c35440-dd75-4de7-a060-4969181e5bfe/25206233954.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/037b66f7-da2b-4e04-9b40-c88a750b6728/paguduwafi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/838513a6-68e1-4578-b41c-6e5cd6824313/notex.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/92387679607.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_off00018c54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C54 5104 bytes
SHA-256: 906fd0d3378e01313e95abf46efd279c6931719dfe781b11cd79be8a087ccf28
font_01_sfnt_off00019dce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19DCE 13128 bytes
SHA-256: fa752abeeb5993ece88dfd6abffdb45800a3f7ceacf5702cdcbbda88e9891770

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