Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b3d00050e40d0c8…

MALICIOUS

PDF

62.4 KB Created: 2021-02-20 22:28:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 450165decc09a2677b0df1fb48bade60 SHA-1: 4c1fda585eb0708b6a2aa113597edbf66990e13f SHA-256: 5b3d00050e40d0c8c35dbb7043e7376b9d6ace08e07bbb6f50791acbf7d5db87
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to disposable hosting and link farms, suggesting an attempt to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags this behavior, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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/123?utm_term=principios+de+economia+gregory+mankiw+6ta+edicion PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383470/normal_601441f34aac5.pdfIn PDF document text
    • https://cdn.sqhk.co/xejarirep/jfgiajh/josuvenilaposozo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375361/normal_60153599667e5.pdfIn PDF document text
    • https://dosoxikovere.weebly.com/uploads/1/3/0/9/130969917/livasabetolivodaseka.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460694/normal_6003b48a91b47.pdfIn PDF document text
    • https://bafuselowazela.weebly.com/uploads/1/3/5/3/135318440/c9b8de643d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456114/normal_5fc7b88c93404.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490725/normal_5fd926f76f8ab.pdfIn PDF document text
    • https://cdn.sqhk.co/gimexigerub/jJghgdd/best_free_gay_dating_apps_for_relationships.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371244/normal_6008ecaa2e6f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496810/normal_6020f91597707.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384299/normal_60190980302ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443329/normal_602f227700932.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450519/normal_6002c4124a123.pdfIn PDF document text
    • https://subokolabipu.weebly.com/uploads/1/3/2/3/132303028/fizuruzejipew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384048/normal_5fdc4663e3658.pdfIn PDF document text
    • https://rijigajigife.weebly.com/uploads/1/3/1/8/131856487/ritarukiz-zimagig.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421336/normal_60037c5f791eb.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/mafavuzenoliki/play_store_for_pc_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/vawuretufodixadi.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_off0000b6aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6AA 5776 bytes
SHA-256: e74d2090a49aff9e478d74488d79a067d60e68f4719d59ed91beec2b54f91f10
font_01_sfnt_off0000ca58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA58 9844 bytes
SHA-256: 9d217d80b3249813c3a308996dd18e4587fda7d007a5b5a54d68ac147bdc5203

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