Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f90d03e92f5af21…

MALICIOUS

PDF

73.1 KB Created: 2021-02-28 00:48:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 31263278feb98e928545162b5d87cf96 SHA-1: 2202a42787f148058e2e6c9daec803aafe8ce03c SHA-256: 1f90d03e92f5af21b095f5de503d0c03abd8b7fe3d776c09a2aafada7f3d1595
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ML and ClamAV, as malicious. It contains numerous embedded URLs, with a notable heuristic identifying it as a link farm on disposable hosting. The document body, though heavily obfuscated, appears to be a lure related to 'baby milestones', directing users to external sites like 'kuzutuzo.ru'. The presence of embedded URLs and the nature of the heuristics suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/123?utm_term=what+are+6+month+baby+milestones PDF link annotation
    • http://vizilamu.22web.org/15157907679.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389358/normal_6024a3badae49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427093/normal_601a342a6ffd9.pdfIn PDF document text
    • http://women-ita.space/muzonuzavexutosonsekn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419003/normal_5fdf32a22c1e7.pdfIn PDF document text
    • https://gebezemimubitup.weebly.com/uploads/1/3/1/0/131070169/5001631.pdfIn PDF document text
    • https://cdn.sqhk.co/nupasoxure/h0jahi9/79848507586.pdfIn PDF document text
    • http://bbflowers.net/xutivenomuxomipobutrvvw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366630/normal_5fc86676a3cfa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468843/normal_600df42fb4309.pdfIn PDF document text
    • https://niwogowepovem.weebly.com/uploads/1/3/4/7/134767936/bovofamuniji.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468289/normal_5fdddcd764d45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449004/normal_600d342aa061a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fonobufusig.rf.gd/avast_for_windows_7_offline.pdfIn PDF document text
    • http://wiwawilif.epizy.com/horoscopo_profesor_zellagro_sagitario_hoy.pdfIn PDF document text
    • http://lerariwafibot.epizy.com/subarachnoid_hemorrhage_nejm.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_off0000e12e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12E 5332 bytes
SHA-256: 0994415bf05215881624a428da401c4ebc5ba5e1956741dc447d2fb671a0a6da
font_01_sfnt_off0000f335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF335 10764 bytes
SHA-256: 5d6e4ebbdf8152aa353a3b9522842a15d5cf87b506d573914688d219a4ee6f5e

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