Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7589088fa723b22…

MALICIOUS

PDF

72.9 KB Created: 2021-02-04 07:24:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ab8e3c786227a23f79bce8e2f22053c2 SHA-1: 92bcbf28335e9fd0921318df5a7eb32f9bb32fd6 SHA-256: b7589088fa723b2284098c935f06479a651e9c87e657744a45cded2adfb51bba
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically crafted to appear as a warrant search result, likely to trick the user into clicking it. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/123?utm_term=el+paso+county+warrant+search+colorado PDF link annotation
    • https://gixujadimi.weebly.com/uploads/1/3/4/7/134708567/8907065.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369141/normal_601391d378aef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383452/normal_601a4c268b449.pdfIn PDF document text
    • http://nejamaranidirit.22web.org/que_es_musica_clasica.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383928/normal_5ff0369b108e8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483103/normal_6000b2dcb4af8.pdfIn PDF document text
    • https://regezubigif.weebly.com/uploads/1/3/5/3/135320660/kejowexudivid.pdfIn PDF document text
    • http://piwakere.iblogger.org/sans_forensic_report_template.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465685/normal_6004e2c0a0aa9.pdfIn PDF document text
    • https://vaseviga.weebly.com/uploads/1/3/3/9/133986607/rajazokizuvuzowuvi.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/fuwenoxuzasila/pesigezaz.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/87671685738.pdfIn PDF document text
    • http://kubusefot.epizy.com/sakigedebiwugo.pdfIn PDF document text
    • http://joxumokuri.epizy.com/catalogo_dupree_campaa_6_2019.pdfIn PDF document text
    • http://jatujij.rf.gd/fijizu.pdfIn PDF document text
    • http://tupomomi.rf.gd/adidas_jersey_sizing_guide.pdfIn PDF document text
    • http://tedejokalegiruj.epizy.com/mavajo.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_off0000df22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF22 5312 bytes
SHA-256: baeb7fa367f7524c1dfc63c334fd49b4ff6a2da4cd2a85a25229373fe4259e2e
font_01_sfnt_off0000f140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF140 11008 bytes
SHA-256: 14c15824ff72d4cae37de48a0b2dd843ed2412bacac60412b381c41a34442e8d

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