Malicious PDF — malware analysis report

Static analysis result for SHA-256 83e3669db030cd80…

MALICIOUS

PDF

72.1 KB Created: 2021-02-20 22:48:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1e69552d5719fe5d7be8f096da0a0a3c SHA-1: 415e521a7f21d592124d7bd95d3773d34ebd853c SHA-256: 83e3669db030cd80bf72b87706f65b5b585cadbed50d0a8a77b95a78946eeece
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to PDF files hosted on S3 buckets and Weebly, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of numerous external URIs suggests an attempt to redirect the user to potentially malicious content.

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://leonvi.ru/aws?utm_term=what+is+the+main+role+of+a+team+captain PDF link annotation
    • https://bopegaxuz.weebly.com/uploads/1/3/1/4/131406849/zamaxajovijoduf_logidofedep_pibireroxol.pdfIn PDF document text
    • https://semulojera.weebly.com/uploads/1/3/2/6/132695334/fiwezusun-gilojekekit.pdfIn PDF document text
    • https://kowagazobavov.weebly.com/uploads/1/3/0/8/130874359/gupakoleniv.pdfIn PDF document text
    • https://foboxujegi.weebly.com/uploads/1/3/4/6/134694162/mafibixateme_votor_ronom.pdfIn PDF document text
    • https://firulozide.weebly.com/uploads/1/3/0/7/130775295/1903ad9e7dba.pdfIn PDF document text
    • https://cdn.sqhk.co/peluxisomex/6gfueI6/53783527945.pdfIn PDF document text
    • https://cdn.sqhk.co/xegapanasa/jiic1yw/3168672109.pdfIn PDF document text
    • https://nuzojumikosa.weebly.com/uploads/1/3/0/8/130814298/4986825.pdfIn PDF document text
    • https://nizakibete.weebly.com/uploads/1/3/4/3/134386075/fowakop-sigesaduliz.pdfIn PDF document text
    • https://rogujodur.weebly.com/uploads/1/3/4/8/134899240/789166.pdfIn PDF document text
    • https://dezijetide.weebly.com/uploads/1/3/4/8/134864221/5373134.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/satudifin/15642985610.pdfIn PDF document text
    • https://s3.amazonaws.com/wozowuledij/77891115752.pdfIn PDF document text
    • https://s3.amazonaws.com/dazemi/medicare_enrollment_form_working_holiday_visa.pdfIn PDF document text
    • https://s3.amazonaws.com/nabifovu/tawudujawusok.pdfIn PDF document text
    • https://s3.amazonaws.com/xelimewat/toyota_diagnostic_trouble_codes.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_off0000de07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE07 5268 bytes
SHA-256: 9bc85515cb6578ef033bd5190d960ae5d97e60d52a98ba61a2ad84ea635bdf90
font_01_sfnt_off0000efd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD4 10472 bytes
SHA-256: 1bd47b5ae63a45525cf16dcf7c124d67977b4f9ae9258e41743856d94f962b2f

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