Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eb2f9889820134e…

MALICIOUS

PDF

67.5 KB Created: 2021-02-11 14:25:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f3538728e777a61029cba94f7c339982 SHA-1: 6b94a9019cf9759461fe2cb24a7dbe47e5ec53cd SHA-256: 9eb2f9889820134e468bed9aab3efd716d68b4a29a0ad46de10908563a0f8704
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating it is part of a link farm designed to drive traffic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and extensive URL farm are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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
  • 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://jacksth.ru/123?utm_term=cardiovascular+review+worksheet+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4495039/normal_5fcc36d50f297.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382408/normal_5fe9ab80211ad.pdfIn PDF document text
    • https://jumirusuvowelu.weebly.com/uploads/1/3/4/6/134632856/jowavakoda.pdfIn PDF document text
    • https://pakurematumomu.weebly.com/uploads/1/3/4/7/134764434/73571d9a93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474471/normal_5fe6ea2f40aff.pdfIn PDF document text
    • https://ximizewilaxeju.weebly.com/uploads/1/3/1/3/131381769/372dce8e.pdfIn PDF document text
    • https://suwudaxodorepe.weebly.com/uploads/1/3/4/8/134885248/vodetabikudera_pamebedali_sosej_wuvomigovaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415546/normal_6019c3db42339.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373505/normal_600a494f17f9e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458621/normal_5fef108c3dab2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477877/normal_5fe39463c5ac4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465539/normal_5fc79af26fcbb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420602/normal_5fdddafbc207c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476282/normal_601b482b16cb4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387929/normal_60004bf45a017.pdfIn PDF document text
    • https://tesegedoveveda.weebly.com/uploads/1/3/4/8/134891870/pozuled.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495039/normal_600a4be12b830.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413226/normal_6009ea7b0e80d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jamurujitexezi.epizy.com/jasper_reports_static_text_new_line.pdfIn PDF document text
    • http://zedafazoteto.epizy.com/repavizavanasezasexut.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_off0000c9d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D2 5148 bytes
SHA-256: ba4fb31027f65d663f2e0c04ec74e581980033da233b234b9ef314ede9514baf
font_01_sfnt_off0000db62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB62 10548 bytes
SHA-256: 9091dbc01c1a68a30fd6b00ef8755a21fa8f3c91271d2cee480183123c439a8e

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