Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fbe6b3cd3293fb4…

MALICIOUS

PDF

72.4 KB Created: 2021-01-20 09:42:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 29555f29066274ca0b2468695240d66f SHA-1: 73c49a4bcb59da029b0132279961f2bea161f717 SHA-256: 0fbe6b3cd3293fb402aeed6b942b59ce861fd62c2eada06c595a871ecf064159
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirectors or disposable hosting, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure align with techniques used to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

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
  • 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 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.
  • 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/123?utm_term=google+hacking+pdf+portugues In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366661/normal_5f89ce455813d.pdfIn PDF document text
    • https://kobuzonoge.weebly.com/uploads/1/3/1/4/131452837/dubetakato_zixudedevu_rekox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393041/normal_5f98ac804d1d0.pdfIn PDF document text
    • https://vujipobunovopo.weebly.com/uploads/1/3/5/3/135324227/batav.pdfIn PDF document text
    • https://sazobumegeti.weebly.com/uploads/1/3/1/4/131407647/davosar.pdfIn PDF document text
    • https://zabugejagovim.weebly.com/uploads/1/3/1/6/131637755/71a0a714f0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458824/normal_5fa15b1749768.pdfIn PDF document text
    • https://gepogujewo.weebly.com/uploads/1/3/1/3/131382217/doxejeda.pdfIn PDF document text
    • https://site-1172435.mozfiles.com/files/1172435/music_arrangement_book.pdfIn PDF document text
    • https://ropujumidud.weebly.com/uploads/1/3/1/4/131406541/d39d54.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fozajekipijijax.epizy.com/tapawa.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/tatoxukeji.pdfIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/format_source_code_in_visual_studio_2012.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD105 5512 bytes
SHA-256: cebbfd82d88729acb9fd98cbfbfd99de039c54bd4f6f7f787049a392859b23d9
font_01_sfnt_off0000e3c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C1 1796 bytes
SHA-256: 68bbe42c93759ab90c218695aa25c1747b40456063d11b0ac06b51d2514fd3e6
font_02_sfnt_off0000ec4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4C 11776 bytes
SHA-256: c1dfeb8c46f342db1166f991deae804dda12420f34a4cda898864b0907d1ccce

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