Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7c9522a11531f23…

MALICIOUS

PDF

106.5 KB Created: 2021-05-18 18:37:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 8ca8289fd4d5bd03a513c53acb57efdf SHA-1: d510a842946bb51f099b5ce76d2fff2ae79fd71f SHA-256: b7c9522a11531f23508a6e0504861e4c42daea2e349e95a771c9941619552be9
156 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which point to PDF files hosted on various platforms. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, suggesting a link farm or SEO poisoning attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. No scripts were extracted, but the sheer volume of external links is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/strik?utm_term=the+death+of+ivan+ilyich+summary+pdf PDF link annotation
    • https://rigivopamakor.weebly.com/uploads/1/3/4/8/134869382/vowabe.pdfIn PDF document text
    • https://zowololo.weebly.com/uploads/1/3/5/2/135294949/fosowi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450430/normal_603e162edae33.pdfIn PDF document text
    • https://gebobofivogaxe.weebly.com/uploads/1/3/5/3/135308574/rixadamemuma.pdfIn PDF document text
    • https://zasawebisev.weebly.com/uploads/1/3/4/8/134865024/da3a735d222c34.pdfIn PDF document text
    • https://xoriforibeb.weebly.com/uploads/1/3/1/0/131071072/95e2e213b892.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425491/normal_600e096789e86.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/jewizopukuni/alfabeto_japones_kanji_completo.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/2749160483.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/859a9900-e883-4deb-82de-00907332a420/what_does_dapple_mean_in_spanish.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed1e7866-89da-4a25-af6e-d5e65772165b/25159666894.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/what_are_colleges_doing_about_mental_health.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/rolazinokitukirabof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44537318-110d-4eb2-a5a4-e9fd9de08c8c/edo_nigerian_names.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/duwerovukal.pdfIn PDF document text
    • https://s3.amazonaws.com/kovozenamofox/princess_bride_free_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08893700-1e1e-46a3-b7da-4b478834646e/76417429822.pdfIn PDF document text
    • https://s3.amazonaws.com/tokudapele/top_10_krishna_bhajan_mp4.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_off000162cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162CC 5508 bytes
SHA-256: 48076a34e16ce77628042d057b88b0387aebf02979c2747bb85ea007e29c2c5f
font_01_sfnt_off00017572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17572 11512 bytes
SHA-256: 8afd328d1120fce3d846003da10a9bc60cd486f7e318f4e708485b893cf97808

Open this report in the interactive analyzer, or submit your own file for analysis.