Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f4476a76ee3aa19…

MALICIOUS

PDF

77.8 KB Created: 2021-05-23 13:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 2fa7860882a0f6de1c2a89b97f8ce21e SHA-1: ff712ac3c0210729d9c6b104aba3c69e13b4ab58 SHA-256: 1f4476a76ee3aa19eb5379835f8dc98825ee1f49d71e88dc93be350cc3c7a555
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 designed to redirect users to potentially malicious content or phishing sites. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://druttle.ru/strik?utm_term=what+is+the+process+known+as+polymerization PDF link annotation
    • https://sejexogubason.weebly.com/uploads/1/3/1/0/131070030/6c37dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425759/normal_60698e90aa772.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503050/normal_5ff8b5bdae9b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480755/normal_6064cc59def0d.pdfIn PDF document text
    • https://pikotawikeju.weebly.com/uploads/1/3/4/4/134496208/9021251.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411916/normal_600c45b9a26bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445754/normal_600b70e35da85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479707/normal_6022d77263595.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468531/normal_5fcd33bf32aca.pdfIn PDF document text
    • https://ninisajata.weebly.com/uploads/1/3/4/8/134869212/5175f.pdfIn PDF document text
    • https://juduloto.weebly.com/uploads/1/3/5/3/135323899/zomuboguduwo-rutalufada.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370066/normal_6013494887916.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407100/normal_602c9c0553ba8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378378/normal_600b75279dc6d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489415/normal_5fee4ccee8825.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497368/normal_602e848e8eb0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426820/normal_606431aca677d.pdfIn PDF document text
    • https://fexafunoketu.weebly.com/uploads/1/3/4/8/134868662/donugulalotigak.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/sitok/how_much_did_the_actors_make_in_harry_potter_movies.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/69413021014.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/nenajen.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/padojovor.pdfIn PDF document text
    • https://s3.amazonaws.com/xonaxevetaf/bloons_td_5_apk_mod_3._18.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/4480719399.pdfIn PDF document text
    • https://s3.amazonaws.com/ximupuv/68399194265.pdfIn PDF document text
    • https://s3.amazonaws.com/wefadep/wujuvaxawomebogumi.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_off0000f3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EB 5496 bytes
SHA-256: e80d4b32d6fe70f85c4980d55f95a406b997c0b26c81da3f49b265237237b260
font_01_sfnt_off00010695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10695 10236 bytes
SHA-256: 16a6a19d4c0164592123d362ac897f34fb99e404d0a18b70a7ee0ad91b559e40