Malicious PDF — malware analysis report

Static analysis result for SHA-256 170d0f0b8b1e29b6…

MALICIOUS

PDF

70.0 KB Created: 2020-11-18 06:40:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 838349f96db411794b43d5707f4460ed SHA-1: 9d511552d29cb17ed572beb88c7972419b570cf9 SHA-256: 170d0f0b8b1e29b6c1412d4f2b936472408c6aa2bb8543e9029a8272afc806f9
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains a large number of external links, many pointing to S3 buckets and other domains, suggesting a link farm or SEO manipulation tactic. The primary external URI observed is 'https://trafffi.ru/strik?utm_term=fritz+the+cat+full+comic', which is likely used to redirect users. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent related to external resource linking.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffi.ru/strik?utm_term=fritz+the+cat+full+comic PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450512/normal_5fa768b795022.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466173/normal_5fa3d2648e181.pdfIn PDF document text
    • https://boguvetasitob.weebly.com/uploads/1/3/1/3/131380850/358210d4ddf3.pdfIn PDF document text
    • https://keziripar.weebly.com/uploads/1/3/4/5/134522929/vivexefegusati-pexapo-pobidatalidot-joxelo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416923/normal_5f990f139b1f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384325/normal_5fa52d5ac182e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367646/normal_5fa7c30e76f96.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/kavitokolezub/jodapowidalel.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/41528474708.pdfIn PDF document text
    • https://s3.amazonaws.com/jemazejodep/81052701828.pdfIn PDF document text
    • https://s3.amazonaws.com/gezejoputiwinu/trieu_con_tim_cua_truc_ho.pdfIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/fitness_beep_test_free.pdfIn PDF document text
    • https://s3.amazonaws.com/dazemi/prozac_nation_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/trig_limits_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/viregujipowuru/brihaspati_mantra_in_telugu.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_off0000d590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD590 4948 bytes
SHA-256: 0dcf239472d3767f465e33f0c0b2260ae0fc539930e8d2ed877d42af7f04a7f6
font_01_sfnt_off0000e64b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64B 10896 bytes
SHA-256: 38287fa2acdf162fda5c19f14c99497c82cc63b423cacc54414824ba38f58cdb

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