Malicious PDF — malware analysis report

Static analysis result for SHA-256 87a27b3ee944580b…

MALICIOUS

PDF

72.1 KB Created: 2021-02-20 03:38:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9d2ef01a006b92660bd750dd1ff55ce2 SHA-1: 7110b4664c75b7c95b4548f497065346797c93da SHA-256: 87a27b3ee944580b1930e1048d985f0cc07d0bdf546ee48e6bb37b5f231a174e
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or phishing campaign. The document body, though heavily obfuscated, contains a reference to 'wkhtmltopdf', indicating it was likely generated by a tool rather than a legitimate document, and the presence of external URIs further supports the malicious intent.

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://jottigo.ru/wix?keyword=how+does+frogs+protect+themselves+from+predators PDF link annotation
    • http://stroymarketmetal.ru/losuzenavarulevuwefimw8hy.pdfIn PDF document text
    • http://clobuss.ru/bishop_score_interpretationcnn31.pdfIn PDF document text
    • http://good-production11.site/418332129151aeb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460950/normal_5fd684545b688.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466146/normal_6001f472afb9a.pdfIn PDF document text
    • http://form-lnstagramcopyrightservices.com/berghaus_down_jacket_size_guidezc5jo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369783/normal_6007440be22ee.pdfIn PDF document text
    • http://reduslimitalia.site/atlassian_confluence_page_templates3fm64.pdfIn PDF document text
    • https://cdn.sqhk.co/luwivimexu/jfjbgh8/fanubotumudopexinek.pdfIn PDF document text
    • http://brosbass.com/richard_schmid_alla_prima_iin4i84.pdfIn PDF document text
    • http://sreview.online/xorugasafitenadim9xev.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368747/normal_6005b9ec3e14f.pdfIn PDF document text
    • https://tiletemilowa.weebly.com/uploads/1/3/2/7/132710791/kozefimo_kuwesi.pdfIn PDF document text
    • http://menbp.online/los_ordenes_del_amoroviea.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000dd03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD03 5680 bytes
SHA-256: 200f0759786f4091e3d37202fe753f6415aefb33f931f8a60d711aa7620eb05a
font_01_sfnt_off0000f049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF049 10316 bytes
SHA-256: 434e16f721b4d6c9195a66195095c770c5b03827fe345d40bc969e8c2dc16507

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