Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8b076447ae507d3…

MALICIOUS

PDF

76.4 KB Created: 2021-03-15 18:59:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 4ca47584055dafaa97869c775b8e466e SHA-1: 13226e9e46108213a282b2baa7b087277d97f101 SHA-256: d8b076447ae507d3cae1598ea36082b22b64d618dc54cd92791f0633ba8fd907
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 numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing campaign. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate an attempt to manipulate search results or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://resalured.ru/wix?keyword=campos+eliseos+sao+paulo PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470391/normal_5fd7ded99a667.pdfIn PDF document text
    • http://diwokaxojizo.iblogger.org/graphic_design_book_cover_template.pdfIn PDF document text
    • http://xejopegig.mypressonline.com/dell_optiplex_9010_all_in_one_max_ram.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387932/normal_5ffb10c17da85.pdfIn PDF document text
    • http://besudigedabax.iblogger.org/this_is_amazing_grace_chords.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388839/normal_602ddb2c89626.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481675/normal_6047b4fb37f92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427080/normal_6018a6c537608.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408712/normal_601d675bc1974.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453117/normal_604bcc72d1835.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450514/normal_5fd068517dd27.pdfIn PDF document text
    • http://supobesopo.mygamesonline.org/tuvomamodepojol.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fodunimuka.epizy.com/73579646695.pdfIn PDF document text
    • http://ratagaze.epizy.com/gufuxorewa.pdfIn PDF document text
    • http://nerelikeg.epizy.com/sepepibojizumu.pdfIn PDF document text
    • http://rasijubesu.epizy.com/printable_wedding_invitation_templates_etsy.pdfIn PDF document text
    • http://fijijap.rf.gd/23603123720.pdfIn PDF document text
    • http://sasukagisodubex.onlinewebshop.net/11176379277.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_off0000ebc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC2 4776 bytes
SHA-256: ed51c3a82ffaadaaf3165d7978ba312d37027317a4d5bd8419af3357b7d21336
font_01_sfnt_off0000fbe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE5 12828 bytes
SHA-256: 5ea2c3a0a5f86e2133fed40cc83949cd311214f7a0763fb39a3f0f7d06833425

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