Malicious PDF — malware analysis report

Static analysis result for SHA-256 51359f9af7fd20e8…

MALICIOUS

PDF

77.2 KB Created: 2021-03-01 05:28:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 0b14f606a876c43873241f996fe6d3c8 SHA-1: adbde14a951ef760110d46f9b5160ff96f00cb71 SHA-256: 51359f9af7fd20e8b4374f85372fecfb68d5116bd28fa69a09ca4f2265960406
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious content. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a malicious workflow designed to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://fokemale.ru/award?keyword=what+is+a+good+embroidery+machine+for+beginners PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384304/normal_602554bba2228.pdfIn PDF document text
    • https://ziresaro.weebly.com/uploads/1/3/4/5/134509830/zitufodibexilitosuz.pdfIn PDF document text
    • https://damobupakul.weebly.com/uploads/1/3/1/4/131453350/05f10f26.pdfIn PDF document text
    • http://merutakozuxonu.22web.org/forixamitesosax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417309/normal_5fe7871312d98.pdfIn PDF document text
    • https://dojilosadokadog.weebly.com/uploads/1/3/4/8/134890500/zekuse.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481420/normal_6005edb8559e4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406228/normal_5ff657305608f.pdfIn PDF document text
    • https://birijejukuz.weebly.com/uploads/1/3/5/3/135386669/3b105a9f9aa9.pdfIn PDF document text
    • http://ponaleke.iblogger.org/kowitujuzobedelo.pdfIn PDF document text
    • http://tupaxeguna.scienceontheweb.net/65387211082.pdfIn PDF document text
    • http://pidawudimo.scienceontheweb.net/sajuxaxofuluwovug.pdfIn PDF document text
    • https://cdn.sqhk.co/mixaluwekitu/dDjdic8/luzilixenilasunafikiluze.pdfIn PDF document text
    • https://cdn.sqhk.co/fabadipub/etJjhjg/gsmarena_iphone_11_review.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wamesugome.rf.gd/games_for_kindergarten_students_free.pdfIn PDF document text
    • http://ferenekukosazu.epizy.com/27646306531.pdfIn PDF document text
    • http://katudajug.epizy.com/93171116563.pdfIn PDF document text
    • http://zamituzok.rf.gd/danakuwekur.pdfIn PDF document text
    • http://baletax.onlinewebshop.net/words_that_start_with_s_to_explain_someone.pdfIn PDF document text
    • http://puduvasogedima.rf.gd/78580536642.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_off0000f0be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BE 5656 bytes
SHA-256: c3579d01d7ade7cdef714ddd584db0d19d3c213753b06b0a0db9becf150410de
font_01_sfnt_off000103e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E5 10240 bytes
SHA-256: 392ad39f20084969d3371335fc0c0294396770143299c1525eaa73720b01dd0a

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