Malicious PDF — malware analysis report

Static analysis result for SHA-256 83b92fe2ae751e59…

MALICIOUS

PDF

84.0 KB Created: 2021-05-19 23:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 012803712aa01d57bbe9174152ecd4f9 SHA-1: d45ba35ff3cc11b6559d58d1cef1ccba93f68ee1 SHA-256: 83b92fe2ae751e595b2540a73295c150f75d57ed62bf0516597c6126298fec4a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a high volume of outbound links designed to direct users to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing 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
  • 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://bologen.ru/strik?utm_term=correction+livre+terminale+s+physique+chimie+nathan PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4474987/normal_60488f5580855.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450727/normal_6052729965a85.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496151/normal_5ff3b149e9e22.pdfIn PDF document text
    • https://jewadasin.weebly.com/uploads/1/3/4/6/134604584/2580415.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494139/normal_606d65cc9d9bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475215/normal_605c6ed2104f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501229/normal_6065a614d12f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382784/normal_6067ce3295409.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379731/normal_5ffb742a51192.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409395/normal_606d5aaa680dc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470833/normal_60068d569e785.pdfIn PDF document text
    • https://jexetapi.weebly.com/uploads/1/3/4/3/134345775/gupigusuleberelunud.pdfIn PDF document text
    • https://jasuxazej.weebly.com/uploads/1/3/4/8/134875243/jopurukawepipe.pdfIn PDF document text
    • https://pozivikebesar.weebly.com/uploads/1/3/4/7/134759309/banebalesokowis.pdfIn PDF document text
    • https://vabeliguteziji.weebly.com/uploads/1/3/1/3/131379360/5019042.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380863/normal_606d2815aba5c.pdfIn PDF document text
    • https://xevibobi.weebly.com/uploads/1/3/4/6/134683071/631e2d2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nimuwet/how_to_read_basic_drum_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/the_pregnancy_pact_full_movie_lifetime.pdfIn PDF document text
    • https://s3.amazonaws.com/suxuzubojut/4584750357.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_off0001068d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068D 5368 bytes
SHA-256: ae0825f19f29a374d78e05084505c7006d30c96d8e77bfbca3db869f4fbf52dc
font_01_sfnt_off000118ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AC 12688 bytes
SHA-256: e0dccbb262b5e185b5c29c8abb0e3f24b8a73106d26563c5c56b1682273a1096

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