Malicious PDF — malware analysis report

Static analysis result for SHA-256 241c1dd3abf937de…

MALICIOUS

PDF

73.6 KB Created: 2021-03-30 15:13:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 1b5afc06d7e36829f3eb7ce5f3c646d2 SHA-1: 5693bc80438a961a23b3114f59f18be74d34c19f SHA-256: 241c1dd3abf937ded5cacdfd4bc18cae62d8f50d9f3228e340a7017b578c4bb5
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to seemingly benign AWS S3 buckets, but also includes a primary malicious URL disguised as a search result for educational material. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution. The presence of a PDF URI heuristic and the embedded URL fact suggest the document is designed to redirect users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dugedepap.ru/award?keyword=10th+class+math+solution+pdf+in+urdu PDF link annotation
    • http://vegunax.getenjoyment.net/8759017652.pdfIn PDF document text
    • https://dazuzoboda.weebly.com/uploads/1/3/4/0/134017564/0e65fc551966b.pdfIn PDF document text
    • http://dapujabowigu.sportsontheweb.net/9576569324.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417652/normal_6034a14cb6fab.pdfIn PDF document text
    • https://jadusulad.weebly.com/uploads/1/3/4/7/134764450/kiguturefez.pdfIn PDF document text
    • https://goneludolazoga.weebly.com/uploads/1/3/4/4/134488647/e40085.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459621/normal_6050e7dc15cef.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/ronatiduzoxij/59156446148.pdfIn PDF document text
    • https://s3.amazonaws.com/kevava/97314673724.pdfIn PDF document text
    • https://s3.amazonaws.com/bisapovepizaj/libemapoba.pdfIn PDF document text
    • http://gupatevefojip.myartsonline.com/kasotoririzegamamuw.pdfIn PDF document text
    • https://s3.amazonaws.com/gagotaniwipure/96719156330.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/gaming_monitor_buying_guide_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/bamepofewalada/spreadsheet_packages_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/batoragubukepo/zikifowebibu.pdfIn PDF document text
    • http://tameladizikep.atwebpages.com/vokugexaxijuvelazomepe.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/interest_expense_balance_sheet_example.pdfIn PDF document text
    • https://s3.amazonaws.com/xepululejiwof/22555120597.pdfIn PDF document text
    • https://s3.amazonaws.com/xipavir/indesign_cs6_templates.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_off0000df8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8A 5492 bytes
SHA-256: 9e034d6c73415f78474f8fc5e3dc81807baf23c577410dd6856c55edb414d85c
font_01_sfnt_off0000f210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF210 11964 bytes
SHA-256: 8c6124f79906aa3c51d3170bf7953cdb33f1c734911d4b1038de26b73194f9a2

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