Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ce607bb02f2b848…

MALICIOUS

PDF

80.0 KB Created: 2021-02-10 14:50:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: fb4046474b637c900320186884904efc SHA-1: 0815062b438b52f76f64a4d184a9f2e094106130 SHA-256: 4ce607bb02f2b84895542d0d7af3fc38d737d5358fa921067356d69c6d4bfce1
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 pointing to disposable domains, indicating a link farm designed to redirect users to potentially harmful content. The presence of external URIs and the classification as a link farm strongly suggest a phishing or malware distribution attempt.

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://jottigo.ru/123?utm_term=sandisk+extreme+plus+128gb+best+buy PDF link annotation
    • http://fimewot.xyz/173130131273jm0r.pdfIn PDF document text
    • http://natur-green.fun/text_message_ringtones7o2dm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426062/normal_601f91752ff49.pdfIn PDF document text
    • http://uggi-ugg.com/memento_mori_jonathan_nolan_espaol74clx.pdfIn PDF document text
    • http://9gusevshop.space/beer_pong_table_ideas_paintingrc1hp.pdfIn PDF document text
    • http://meveteletav.22web.org/gnma_mbs_guide_chapter_24.pdfIn PDF document text
    • http://vuxiparami.22web.org/anime_apk_apps.pdfIn PDF document text
    • http://greenbike.shop/hot_rolled_and_cold_rolled_steelsbks1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383806/normal_5ff2e4512883d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413244/normal_5fffcff26f319.pdfIn PDF document text
    • https://viwukafum.weebly.com/uploads/1/3/0/7/130738591/gupizujow.pdfIn PDF document text
    • https://nimimetifav.weebly.com/uploads/1/3/2/8/132814674/xemovuwulakizezujeka.pdfIn PDF document text
    • http://logvoz.ru/56387665670hn48o.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450896/normal_60077bafb5dfe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jibovofafef.epizy.com/vunubujetajevopisofomil.pdfIn PDF document text
    • http://wapowidomuf.epizy.com/steam_api64._dll_skyrim_special_edition.pdfIn PDF document text
    • http://rawarawoxegig.epizy.com/41567733694.pdfIn PDF document text
    • http://rowomasogig.epizy.com/8778525889.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d35a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35A 11976 bytes
SHA-256: a27347ab687daaf3b45be12ec99861db5019d721c714e9f9197f63e655e16c26
font_01_sfnt_off0000f8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C2 6132 bytes
SHA-256: 9f4c68784d834848c21a3b8d64085e72d8320f8d89909a846aec9852560392ef
font_02_sfnt_off00010d94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D94 10884 bytes
SHA-256: f5c577c82c5582d5a05b2837fa6837509dfd29d6b85eaa94dcd2a1f6fe2af911

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