Malicious PDF — malware analysis report

Static analysis result for SHA-256 77ef58ac7fcd248e…

MALICIOUS

PDF

78.5 KB Created: 2021-04-26 11:29:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 97bd53f6bc6cdfee8fafcdd15f239b15 SHA-1: a669dd3d1da9a3334ba2c3be2fd095bd48e8f17c SHA-256: 77ef58ac7fcd248e91740b93a442810642dd3ba5011604691e67601e04b9415d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many pointing to benign-looking PDF files, suggesting a link farm or SEO poisoning tactic. The primary URL, https://botokaw.ru/strik, is flagged as malicious and likely serves as a lure for phishing or malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or a trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • 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://botokaw.ru/strik?utm_term=organic+chemistry+reaction+practice+problems+with+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4447641/normal_5fde9a841de3c.pdfIn PDF document text
    • https://murarukaxew.weebly.com/uploads/1/3/4/6/134666391/5141004.pdfIn PDF document text
    • https://fafafupoxojamu.weebly.com/uploads/1/3/5/3/135350358/fc6f94362.pdfIn PDF document text
    • https://fujireroxilurig.weebly.com/uploads/1/3/4/6/134649353/mekoxogagakikaz.pdfIn PDF document text
    • https://cdn.sqhk.co/novoganug/idjdYtE/xadugitifafunekositufuga.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499995/normal_5ff08e77f0349.pdfIn PDF document text
    • https://cdn.sqhk.co/gizoxemovefi/dauNwPG/81899156946.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477886/normal_5fe7f00d04c18.pdfIn PDF document text
    • https://cdn.sqhk.co/padixemugex/hdhh7m5/29625666536.pdfIn PDF document text
    • https://xagajanum.weebly.com/uploads/1/3/4/5/134599721/rusupizupopawapodo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465935/normal_60516fb061524.pdfIn PDF document text
    • https://serataxufo.weebly.com/uploads/1/3/1/6/131606193/zumuriwuwabov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375196/normal_60241a76bed7d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://binewazuliv.epizy.com/where_can_we_donate_furniture.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/83864267785.pdfIn PDF document text
    • http://lesiterifok.epizy.com/contoh_amdal_perusahaan_kertas.pdfIn PDF document text
    • https://s3.amazonaws.com/minegikukovel/bezasenometa.pdfIn PDF document text
    • https://s3.amazonaws.com/fajetufekejo/zazuwedevu.pdfIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/acas_discipline_and_grievance_at_work_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jagux/govalepotukavivovo.pdfIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/80447679347.pdfIn PDF document text
    • https://s3.amazonaws.com/gupojakami/99657020731.pdfIn PDF document text
    • http://kulixuvomewono.epizy.com/50715879085.pdfIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/dawar.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_off0000f45f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45F 5708 bytes
SHA-256: b76e3ba244e003df97e1f3b0588700393a3715cc729ccdee3eef626327eec550
font_01_sfnt_off000107ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AE 10716 bytes
SHA-256: 4e68ae967b0f45da0b2d06dc4e02ec4b307fb5525d10ed9d6e923a3f421aa890

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