Malicious PDF — malware analysis report

Static analysis result for SHA-256 62a9fc5cd352f566…

MALICIOUS

PDF

78.4 KB Created: 2021-04-18 07:55:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27e49dedbac0db860f696b91dcfba121 SHA-1: 4618f284772cbcb0b09597eb3dcb69ffe948bcbe SHA-256: 62a9fc5cd352f566e04f8826da565ecdafec2eeb5724fa96463db6734b0f04fd
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The primary URL, https://xezojetit.ru/strik, suggests a phishing or spamming attempt, potentially related to search engine optimization. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/strik?utm_term=how+to+reset+check+engine+light+2012+nissan+sentra
    • https://molusodufewi.weebly.com/uploads/1/3/4/4/134465793/2393395.pdf
    • https://cdn-cms.f-static.net/uploads/4420747/normal_60400da31990e.pdf
    • https://mimudokax.weebly.com/uploads/1/3/4/7/134742140/3959538.pdf
    • https://cdn-cms.f-static.net/uploads/4369164/normal_603b7203f20f3.pdf
    • https://pasezarovatif.weebly.com/uploads/1/3/4/8/134858127/furepogiforuxokuni.pdf
    • https://datugabow.weebly.com/uploads/1/3/4/7/134745554/wamimafopod.pdf
    • https://cdn-cms.f-static.net/uploads/4415748/normal_6062b21137121.pdf
    • https://static.s123-cdn-static.com/uploads/4374860/normal_5fdcb3db2ae5d.pdf
    • https://cdn-cms.f-static.net/uploads/4463528/normal_603f38b3b7473.pdf
    • https://robesiladobaluj.weebly.com/uploads/1/3/0/8/130813577/1162386.pdf
    • https://kitopelok.weebly.com/uploads/1/3/4/3/134355781/rejaganu-dajolizafejuzi-dototidovevi.pdf
    • https://static.s123-cdn-static.com/uploads/4488604/normal_5ff805f319ae8.pdf
    • https://cdn-cms.f-static.net/uploads/4462073/normal_6039c3486dffe.pdf
    • https://cdn-cms.f-static.net/uploads/4460460/normal_6029ab53c9973.pdf
    • https://naroxelilokatud.weebly.com/uploads/1/3/1/3/131384214/delidujapiloz.pdf
    • https://cdn-cms.f-static.net/uploads/4368246/normal_602264617968f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/remeranexe/historia_de_mexico_unam.pdf
    • https://uploads.strikinglycdn.com/files/f2ab3afd-65d1-43ad-aa54-aa57a19aacdd/does_student_council_need_to_be_capitalized.pdf
    • https://uploads.strikinglycdn.com/files/93643aba-c7ac-4454-8185-7612a1937e0c/16248808447.pdf
    • https://s3.amazonaws.com/vipinib/famejitakevumurixapid.pdf
    • https://s3.amazonaws.com/xirixepo/acrobat_reader_dc_64_bit.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f36e.bin
519b0ef01f77fa413a35499af9fa4c563f385862f9b44b3065e0e0b8182847a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF36E 5504 bytes
font_01_sfnt_off00010637.bin
a454e61b3633783345bf77a50f80bd9f8b876cf5c6943a93b041b8c20e553fb3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10637 11116 bytes

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