Malicious PDF — malware analysis report

Static analysis result for SHA-256 efcd166ff3c6688a…

MALICIOUS

PDF

75.0 KB Created: 2021-03-01 02:59:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 71da88c033eec416aa6d65586f584fbe SHA-1: 4088be92dc7e739162697ea2728bdec3098ffb56 SHA-256: efcd166ff3c6688adfed5c87694e8a0fc57672bda98c6920c5c59b2067ce11e3
184 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 links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards it being used to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://gimoguvi.ru/award?keyword=tintin+castafiore+bijoux PDF link annotation
    • https://voteweze.weebly.com/uploads/1/3/5/3/135346586/428820.pdfIn PDF document text
    • https://rukururage.weebly.com/uploads/1/3/0/9/130968917/4653291.pdfIn PDF document text
    • http://dalidusiz.mywebcommunity.org/38177989257.pdfIn PDF document text
    • https://kebuwusatame.weebly.com/uploads/1/3/5/3/135343151/jolumomibunara.pdfIn PDF document text
    • https://kifeketefisub.weebly.com/uploads/1/3/5/3/135347095/220832.pdfIn PDF document text
    • http://kapusta.pro/32645960095yjcyv.pdfIn PDF document text
    • https://magirakikepemun.weebly.com/uploads/1/3/4/0/134000039/218931.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367920/normal_5fe12918017c9.pdfIn PDF document text
    • http://tonagruz.ru/american_heart_association_bls_manuaoc10x.pdfIn PDF document text
    • http://vuvulusigi.scienceontheweb.net/redigukimewebulubilimas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495988/normal_5ff2a86cba4d3.pdfIn PDF document text
    • https://nobaloledajasom.weebly.com/uploads/1/3/2/6/132681012/ridozasiteja.pdfIn PDF document text
    • https://rasiguxi.weebly.com/uploads/1/3/5/3/135314707/goxowagozefa.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/ruzaganog/87029326327.pdfIn PDF document text
    • http://futikuzita.onlinewebshop.net/gubanijexeg.pdfIn PDF document text
    • https://s3.amazonaws.com/gurafoga/the_three_musketeers_imdb_parents_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/zosiziwodukapapuxube.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E43 5076 bytes
SHA-256: 7bc0a9f0bc69e2eface802bb868908978db8c08dfdd09fb31f043c4f3ea4deb0

Open this report in the interactive analyzer, or submit your own file for analysis.