Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0e42e222a543013…

MALICIOUS

PDF

76.2 KB Created: 2021-02-14 02:09:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 471a95eddc233cac724a5763724c0bd7 SHA-1: 3dea2dd5592ee39c41566b33ad922a12d87e731b SHA-256: d0e42e222a543013a536cc58cbb2febdd039a2cae4d31134941e572f2db99974
134 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, many of which point to disposable hosting and are used in a link farm, suggesting a phishing or scam operation. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=jolly+phonics+group+1+words+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420449/normal_6019dae896d39.pdfIn PDF document text
    • http://lnstagram-helps-contact.com/34810280150jwusx.pdfIn PDF document text
    • http://help-mediasupport.com/standing_yoga_asanas_namesdokhj.pdfIn PDF document text
    • http://pmaider.com/pavelujetukaxogpk0u.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404523/normal_5fcce5c04658f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381081/normal_601eb45e65a4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393018/normal_6024cfd8ae430.pdfIn PDF document text
    • http://samyog.ru/vocabulary_for_ielts_with_answers_audioxzv1y.pdfIn PDF document text
    • http://wirelessinfo.ru/siwibijupebafopadaviguminf15.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484359/normal_5ff3f5139dc6e.pdfIn PDF document text
    • http://kemytbok.xyz/460532854132iey6.pdfIn PDF document text
    • http://citruss.space/fimosejulawikisesudasajijya0m.pdfIn PDF document text
    • http://prizinsta24.space/daxigufiwefodbc4f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417122/normal_600341da0d431.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/donarepemi/bounce_tales_for_java.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_off0000e9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D0 5424 bytes
SHA-256: 9549cfe42af644c151412f832af7140dabe480f88b75fab884f1df89472f31d1
font_01_sfnt_off0000fc58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC58 11664 bytes
SHA-256: 92e0f07a6da5c2608adb2a224836e822649b9ee1582346f1ab772d2044372e91

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