Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d3180db211bac4b…

MALICIOUS

PDF

73.4 KB Created: 2021-03-13 19:41:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 0198d368f0ca842b73a5755587e5ec10 SHA-1: a776028cdf2a3b8e24dc9323236eb78a3e882b59 SHA-256: 4d3180db211bac4b70feda1eaebdbb9bb07f0b8101a6336ec064e54cd3028316
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and exhibiting link farm characteristics, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

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://xajibur.ru/strik?utm_term=vermont+castings+encore+2550+service+manual PDF link annotation
    • http://pofuxubilet.sportsontheweb.net/cuisinart_ss-10_vs_ss-700.pdfIn PDF document text
    • http://mamubisuk.mypressonline.com/les_miserables_broadway_2014_full_show.pdfIn PDF document text
    • http://help-feedback-amzn3.xyz/may_who_full_movie_subtitle_indonesiadzbr5.pdfIn PDF document text
    • http://zorerozovoxul.22web.org/how_much_weight_can_a_250cc_atv_hold.pdfIn PDF document text
    • http://wavapivanuf.scienceontheweb.net/xekina.pdfIn PDF document text
    • http://autobaff.xyz/15109517888nsv6m.pdfIn PDF document text
    • http://agent-ritual495.online/words_to_describe_moonlight_sonatabz4jk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378641/normal_602621b89ef27.pdfIn PDF document text
    • http://tamodemuror.getenjoyment.net/brahms_hungarian_dance_5_piano.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412154/normal_6008172a817c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421335/normal_5fe7534e40709.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/pisik/tefigumipugonovexu.pdfIn PDF document text
    • http://wejajesenopezoj.onlinewebshop.net/76604366234.pdfIn PDF document text
    • http://dalofib.rf.gd/89409234945.pdfIn PDF document text
    • https://s3.amazonaws.com/tirimofufemukat/14387936227.pdfIn PDF document text
    • http://gemakeruw.epizy.com/free_intro_template_adobe_premiere.pdfIn PDF document text
    • http://lugirike.epizy.com/6047013857.pdfIn PDF document text
    • http://tebuvarajeba.epizy.com/zilopakaba.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_off0000ddf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF1 5540 bytes
SHA-256: 85d033a4c51584fa7e873af950eddc093511977e938abbe2938e9d18828ce2e9
font_01_sfnt_off0000f0c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C0 12184 bytes
SHA-256: 84f67c9f5be6c8bdbdff9e7ff56b2ee211cd8aa54d02dccbfe49bc9d86be337e

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