Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b7f898a06c25069…

MALICIOUS

PDF

75.6 KB Created: 2021-02-22 20:40:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 2d31ab5ac35336dffe7d1e248dffd33b SHA-1: a92a9d9882cf11bda4c20441eea579acf608091d SHA-256: 6b7f898a06c2506942052b8cb41d51a8291ee160371601d273a15ce393dee429
126 Risk Score

Malware Insights

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

The PDF file 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 redirection mechanism. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a date, but no clear user-facing text. The presence of external URIs and the link farm heuristic indicate an attempt to direct the user to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/wb?keyword=kenwood%20tm%20d710%20aprs%20settings PDF link annotation
    • http://2022god.com/91147273171u1gvp.pdfIn PDF document text
    • http://starkrobotics.org/3189333617582vtf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412891/normal_5fe0a5c9e2254.pdfIn PDF document text
    • http://wonnaturila.space/sarolaputekifu144xf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478683/normal_60026854710d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424951/normal_60262c9460db7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470014/normal_5fe7c87e7098d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376120/normal_60114a32db108.pdfIn PDF document text
    • http://edalovert.xyz/365169690903loun.pdfIn PDF document text
    • http://netewe9.xyz/3d_to_stl_converter_online3nvsy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417305/normal_5fe0cff92c2c7.pdfIn PDF document text
    • http://devicesprotectionforusers.site/crear_sopa_de_letras_para_imprimir_gratis4p3bq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407087/normal_600648a9e8a79.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mavefigekote.rf.gd/5946398833.pdfIn PDF document text
    • http://purotowuzogivu.rf.gd/atonement_ian_mcewan_goodreads.pdfIn PDF document text
    • https://s3.amazonaws.com/kiremefegonar/53956678193.pdfIn PDF document text
    • http://tuxavilewik.rf.gd/caustic_3_key_android.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_off0000e916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE916 5580 bytes
SHA-256: 96631c65e41514bf54991c04ee5b2028c7233e4931bd94feb41a3fe17383dd73
font_01_sfnt_off0000fc26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC26 10828 bytes
SHA-256: 98da539aab2a3fd27d318469c143952da034de881fbe6d925af4ebe7bfe4abf1

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