Malicious PDF — malware analysis report

Static analysis result for SHA-256 71d2039035458243…

MALICIOUS

PDF

95.8 KB Created: 2021-02-17 10:41:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 0084e92586d8bf3151c0d6491f571220 SHA-1: f4f225aa850a09b74110e38d9467cd5c604dc17f SHA-256: 71d20390354582437803394363d373fa10d073694a2dfb7ff962c00fc8fa172e
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to link farms and disposable hosting, indicating a phishing or ad-revenue generation scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful websites.

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/wix?keyword=angle+pairs+worksheet+answers PDF link annotation
    • http://opsnatur.fun/full_form_of_eepromqu6cb.pdfIn PDF document text
    • http://webpost.pro/classifying_numbers_review_worksheet8rxmj.pdfIn PDF document text
    • https://bobefadapuxat.weebly.com/uploads/1/3/4/8/134858353/a63a163a99.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413236/normal_5ff26b01cb612.pdfIn PDF document text
    • http://pro-komp-master.website/sozixinapukzvtrp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489734/normal_5fd09f688d96c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501794/normal_5fdf17c55ce11.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379602/normal_5fecf76961e8d.pdfIn PDF document text
    • https://roguraluvi.weebly.com/uploads/1/3/0/7/130776180/vokovopusegavofup.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490364/normal_5fce86c49a654.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386081/normal_5fd63dd960450.pdfIn PDF document text
    • https://burevojaziji.weebly.com/uploads/1/3/4/7/134729690/0be99.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/zozofufulolig/28848458711.pdfIn PDF document text
    • https://s3.amazonaws.com/fejatepudopito/administracion_de_empresas_informacion_sobre_la_carrera.pdfIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/ifrs_vs_gaap_reporting.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/87663532598.pdfIn PDF document text
    • https://s3.amazonaws.com/xixonu/54197936691.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13130 2828 bytes
SHA-256: a17885b4fd577e0298a64705d5055d2ac7c2363fd7008e9cf236b3df412a17d8
font_01_sfnt_off00013b2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B2A 5224 bytes
SHA-256: 2f799eaddbe5f45a9e4c6cacc3a7642147063bb376642d54c8e456c676f9c0b4
font_02_sfnt_off00014d00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D00 10160 bytes
SHA-256: 4e7a7c36ddc06cbb9a73e86ae8b39ef8cd53e846fde36456a3a23ba4f7c48b94

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