Malicious PDF — malware analysis report

Static analysis result for SHA-256 eda4f8c41dd915de…

MALICIOUS

PDF

94.4 KB Created: 2021-05-29 21:50:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 4dbc335ad6fcb0251cb48ba642404927 SHA-1: 7608cf2ea6532976a13451cfcb0bfb918794720a SHA-256: eda4f8c41dd915dea08877ce34b79f1f0ff9dfa4b7c118a9562c5dd6c26ef47c
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be a lure related to OECD transfer pricing guidelines, aiming to trick users into visiting malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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://vilenefex.ru/strik?utm_term=oecd+transfer+pricing+guidelines+2017+summary PDF link annotation
    • https://gupamawuma.weebly.com/uploads/1/3/4/6/134602371/a982bf348.pdfIn PDF document text
    • https://jizirazizeki.weebly.com/uploads/1/3/4/5/134509590/mavab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449399/normal_602cd8124ff2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485448/normal_6037d1784362e.pdfIn PDF document text
    • https://wuwudaxu.weebly.com/uploads/1/3/4/4/134493329/30991f0d275ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420448/normal_60463432d93f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409394/normal_6029a55be5349.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446770/normal_5fdd69f179ed7.pdfIn PDF document text
    • https://fevadejo.weebly.com/uploads/1/3/0/8/130814338/587479a139e14.pdfIn PDF document text
    • https://rebusisi.weebly.com/uploads/1/3/4/0/134017700/8412efab.pdfIn PDF document text
    • https://jetesobamu.weebly.com/uploads/1/3/5/3/135323438/8729173.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377908/normal_601ec9ebc3074.pdfIn PDF document text
    • https://rabugotekinevod.weebly.com/uploads/1/3/1/8/131871666/xesowolejinofu.pdfIn PDF document text
    • https://gujaninarenuwin.weebly.com/uploads/1/3/4/3/134319279/gelofojoneneg.pdfIn PDF document text
    • https://wawokosekipazas.weebly.com/uploads/1/3/1/4/131452886/vusogufagaxudi-pabuwegi-reburasevebisi-guzivulureraje.pdfIn PDF document text
    • https://tijisuxijofijo.weebly.com/uploads/1/3/4/3/134374136/xemabilifekeguziziza.pdfIn PDF document text
    • https://zeduwekikozive.weebly.com/uploads/1/3/6/0/136050246/7997087.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fd10229-05b4-4b97-b629-bfa7d3ce61a7/vujutovimelavesivefefov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/815f90b8-340b-48c0-b818-68adfc64a45e/girezifemenukonad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30f8b3ee-fab4-4bd2-a5b4-27a8131aff77/how_to_install_a_kreg_router_lift.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f77a9ffb-92dc-408d-a228-ed6c080629c0/ryobi_2000_psi_pressure_washer_specs.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_off0001302e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1302E 6008 bytes
SHA-256: 3db15402d8e11eb186216950cabd5ab27e5d9c91555f9243331ee39e6494f8a3
font_01_sfnt_off0001449e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1449E 11072 bytes
SHA-256: 0a09bc403a2b1f7eb6036581646a1b3d899459fd213fd03c8f7d195390135d71