Malicious PDF — malware analysis report

Static analysis result for SHA-256 3898ad6047e8609d…

MALICIOUS

PDF

77.5 KB Created: 2021-02-25 18:55:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 2ccc497bfb89a734f2109cd5268f7648 SHA-1: a438d5959882e0087b44e574e384fe816871fa66 SHA-256: 3898ad6047e8609d6254258aeed50bf8529a6e38b660e2d3cc3f950eb3a6880c
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection scheme to host malicious content. The document body, though heavily obfuscated, contains metadata related to PDF generation and a title that appears to be a lure.

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://bologen.ru/123?utm_term=how+to+make+a+4+step+buttonhole PDF link annotation
    • http://mapotilij.mygamesonline.org/binomial_theorem_expansion_worksheet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389606/normal_5fc6aefd3e5b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366302/normal_600aaa55780e5.pdfIn PDF document text
    • http://famozosivupiwij.sportsontheweb.net/81694251042.pdfIn PDF document text
    • http://rajukilodagoje.mygamesonline.org/12372508533.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389376/normal_6009d3c617505.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476767/normal_60047e58628af.pdfIn PDF document text
    • http://fukuzowi.sportsontheweb.net/titulos_de_credito_definicion_doctrinal.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501029/normal_5fee6fd0561c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391954/normal_602c17aad73a3.pdfIn PDF document text
    • http://wewifodajukovu.iblogger.org/blank_bi_fold_brochure_template_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://xumizaxojumiko.epizy.com/factors_affecting_drug_metabolism.pdfIn PDF document text
    • http://ribibepope.epizy.com/tawexalovonur.pdfIn PDF document text
    • http://sisuraregimu.rf.gd/ios_13_beta_8_ipsw.pdfIn PDF document text
    • http://lelirovosas.epizy.com/busegivarefini.pdfIn PDF document text
    • http://bakefedov.epizy.com/what_girl_names_mean_fearless.pdfIn PDF document text
    • http://kepofif.onlinewebshop.net/are_lock_picking_tools_legal_in_california.pdfIn PDF document text
    • http://jigosip.epizy.com/54923342621.pdfIn PDF document text
    • http://nepafex.epizy.com/babedolalejusi.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_off0000e626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE626 5144 bytes
SHA-256: ab817cf3d1abea30c0412225e3b9c044bb8343e9906ad99e2c3f1966de6a4669
font_01_sfnt_off0000f788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF788 10448 bytes
SHA-256: c1f2fdd21681f648ac2198f62d528a0f09be8bec29acd50403770d7015043c09
font_02_sfnt_off00011ae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE0 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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