Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7f031d03133ee87…

MALICIOUS

PDF

69.6 KB Created: 2021-03-01 14:47:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e1c84eca240b58fb8b66728d1e8dc637 SHA-1: b1df9b9b7d1a1768d4f6c2c5483d653067d56017 SHA-256: a7f031d03133ee871dd0f3697c1be60985a322c4e63ebfad01903503a6b9a9ad
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains numerous external URIs, many pointing to disposable domains, suggesting a link farm or phishing attempt. The ML classifier also strongly indicated maliciousness. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs suggest it is designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://leonvi.ru/strik?utm_term=delta+11-990+parts+diagram PDF link annotation
    • http://gopadaxin.mywebcommunity.org/kevuviketedexelus.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385021/normal_5fefd26b5c3cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461748/normal_602af419b254c.pdfIn PDF document text
    • https://cdn.sqhk.co/birenejar/ij0jfja/44892529105.pdfIn PDF document text
    • http://futup.ru/buzzard_bird_in_spanishc135q.pdfIn PDF document text
    • http://zitokujamu.mypressonline.com/41226411507.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384469/normal_5fcf8363e4c86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504791/normal_5fdc63d9ac611.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483855/normal_5fdbda5b32564.pdfIn PDF document text
    • http://sarhello.online/suvozizitodijb0j.pdfIn PDF document text
    • http://bizbize-yeteriz.org/agential_realism6otjd.pdfIn PDF document text
    • http://frasqen.online/69850951588iqslp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365582/normal_5ff1b545eca7d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448121/normal_5fdd414172fd0.pdfIn PDF document text
    • http://tokio-2020.fun/mizofipexufaisksp.pdfIn PDF document text
    • http://komaxinatobofe.medianewsonline.com/xixupuboputuruzozabiraso.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/gumagabu/kinematics_worksheet_1_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/fatisake/90657643136.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/20940281378.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/fisoverelatasolakakaguj.pdfIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/wumatezalorironutagof.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F5 5660 bytes
SHA-256: a76437938a4474bb04937781f99bdac57ffcbf182d39b376ff2f866a9e71d174
font_01_sfnt_off0000e634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE634 10392 bytes
SHA-256: 7ce3c939663e29ed25dbe2ae7a040702399b363e1cfb5f3f792552bbd50282e0

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