Malicious PDF — malware analysis report

Static analysis result for SHA-256 23bd33ba71d356d4…

MALICIOUS

PDF

83.6 KB Created: 2021-06-11 01:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3e2887c01713405cba5917724bfab5f5 SHA-1: e4016f4f03a81bbd4c60ff3e7f4c6c9effe0bec0 SHA-256: 23bd33ba71d356d4e7b26e2ae902a8fec460a0beacf009e1d597de9b1af94a91
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://synerhu.ru/pbw?utm_term=area+of+triangles+and+trapezoids+worksheet+answers PDF link annotation
    • https://vafoxerosasajox.weebly.com/uploads/1/3/5/3/135398531/1617162.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463554/normal_600d88c70118c.pdfIn PDF document text
    • https://pamarilu.weebly.com/uploads/1/3/4/3/134322341/7054315.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452839/normal_60c1c5337583e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392451/normal_602a21599eff4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466689/normal_603b14e6e3eb2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422367/normal_60358c0651df5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383586/normal_6060d911790da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455207/normal_602a9884ccdfd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416331/normal_60462fc046786.pdfIn PDF document text
    • https://sovirufumidek.weebly.com/uploads/1/3/4/9/134902413/jefinunuburem_noravefeveku_tinusoditataw_tujoros.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366007/normal_6040bbccf0ac8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418381/normal_60342edc34dab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481515/normal_5fc95cd2db62a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jolowajuwijo.pbworks.com/f/79284188636.pdfIn PDF document text
    • http://ruwezebom.pbworks.com/f/raid_shadow_legends_steelskull_masteries.pdfIn PDF document text
    • http://xuruzinijub.pbworks.com/f/valores_normales_de_amilasa_y_lipasa_serica.pdfIn PDF document text
    • http://lakiluxodev.pbworks.com/f/7998659243.pdfIn PDF document text
    • http://lesokulovisu.pbworks.com/f/wulokakata.pdfIn PDF document text
    • http://negaboxa.pbworks.com/w/file/fetch/144601716/what_is_the_relevance_of_knowing_theories_of_language_development.pdfIn PDF document text
    • http://letonepamusi.pbworks.com/w/file/fetch/145085475/all_shrine_locations_in_zelda.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_off00010893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10893 5500 bytes
SHA-256: 13ca3b1b175290248f7f336adeead5e702dcd6ac875ba7ec7abb4073355e4e21
font_01_sfnt_off00011b61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B61 11036 bytes
SHA-256: 4a7fbc2332489307c8bef206cfa1445b2b33a72410f0859bc207072b3b3f3268

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