Malicious PDF — malware analysis report

Static analysis result for SHA-256 15b5887c69ee31fb…

MALICIOUS

PDF

70.0 KB Created: 2021-02-27 07:32:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: d7c95f7269674baaf044f5c5e193d08a SHA-1: c1829132b3b08e7c0014c002fdd3ee3351677fb4 SHA-256: 15b5887c69ee31fb3f50f279320953840cfd9e85b7384c9be358e130985a06ec
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The primary malicious URL identified is https://yafferge.ru/strik?utm_term=subtraction+with+regrouping+place+value+blocks, which is likely used to deliver a phishing page or a second-stage payload.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=subtraction+with+regrouping+place+value+blocks In PDF document text
    • http://airbin.top/73819238948ffnmf.pdfIn PDF document text
    • http://gagivukamuw.getenjoyment.net/popofokavutubik.pdfIn PDF document text
    • http://lenudes.com/tuvojilofibazugkdztv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418170/normal_6000c186e1c2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481056/normal_601b47768e2c7.pdfIn PDF document text
    • http://tulavesew.getenjoyment.net/satuma.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466659/normal_5fe490868f322.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479433/normal_6039c19b0b55a.pdfIn PDF document text
    • http://zodatowafe.getenjoyment.net/why_was_the_dawes_act_of_1887_unsuccessful.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/godewumazek/auto_typer_android.pdfIn PDF document text
    • http://pusevim.epizy.com/bromelina_literatura.pdfIn PDF document text
    • http://lixumogal.epizy.com/informational_report_writing_grade_5.pdfIn PDF document text
    • http://napipipazapuka.epizy.com/99150424723.pdfIn PDF document text
    • http://rulamiji.onlinewebshop.net/gemezutewinixixa.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_off0000d415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD415 5656 bytes
SHA-256: 379ff7f07f809fb4f5e5c31e15298d2886782a182195ec03080d4d5da070e4fc
font_01_sfnt_off0000e766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE766 10240 bytes
SHA-256: d184cffba24b0d2cbb3970fa361fc2e539bce59b428f84d0a5fef778b9b1c600

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