Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4ee1edc14907477…

MALICIOUS

PDF

79.0 KB Created: 2021-03-15 22:01:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c85a803556190ceb0ffba388fd935c6f SHA-1: fb4e158a874facfd68dc6497c6c2a2ff255f8b1c SHA-256: d4ee1edc1490747753f3423bc45791b33538fd8b8bbab31fbd7d5c387ab93477
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external URIs, with a high concentration of links on disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via the primary URL. No scripts were extracted, but the PDF structure and URI heuristics point to a social engineering attack.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=samsung+hw-j355%252Fzc+soundbar PDF link annotation
    • http://kowezuzapine.66ghz.com/10517372570.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452376/normal_6014111cd86ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384144/normal_6033268973f62.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403674/normal_5fef4475b813d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452599/normal_60102a0e2a7b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366381/normal_60215bbae1ed6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379483/normal_5ff5668397d70.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422385/normal_5fe5d34eb3494.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450242/normal_604f2e3c0efdf.pdfIn PDF document text
    • http://sifinujox.sportsontheweb.net/84035076767.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446155/normal_6031f8096f2a0.pdfIn PDF document text
    • http://zawukinaloluku.sportsontheweb.net/85114681327.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/vitelitubovuluj/everest_base_camp_guide_book.pdfIn PDF document text
    • https://s3.amazonaws.com/pavujiniz/why_is_my_calculator_rounding_ti-30x_iis.pdfIn PDF document text
    • http://vububajoli.rf.gd/gujuguma.pdfIn PDF document text
    • https://s3.amazonaws.com/tibitexil/synonyms_worksheets_for_6th_graders.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4441b36b-3176-495f-9293-47642ff2cc3b/dezuxipexanuzuweluli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a99e36ed-d2f1-4b88-a75d-e6fd596f28db/audio_technica_lp60x_stylus_replacement.pdfIn PDF document text
    • http://gexokaxaxitinug.rf.gd/suntrust_bank_auto_loan_loss_payee_address.pdfIn PDF document text
    • http://geralumumavol.rf.gd/26445892888.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF1 6140 bytes
SHA-256: ac0d3c3c87e1cea81cc8df809bbe6c326739daed26a82f752d6aa6ecc6da71f4
font_01_sfnt_off0000f1d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D6 10944 bytes
SHA-256: a2558a957bdb198408f0131bff16fa86720d8817eea85fb4f098a25bf18406c7
font_02_sfnt_off00011783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11783 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501

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