Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3b3fa73419cda05…

MALICIOUS

PDF

78.2 KB Created: 2021-03-25 23:44:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 2c14a1bba1cb97fcb5d11c44dd4f5624 SHA-1: c9b98d2dc50050554a14bd5aa15f2c9945334c2e SHA-256: f3b3fa73419cda050150d2e737ccea2d7f801b9224b12a3d8b0964bf2577dff3
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm on disposable hosting. It contains multiple external URIs, including suspicious domains like seumenha.ru and nnorm-id.com, which are likely used to redirect users to phishing or malware distribution sites. The PDF structure and embedded URIs strongly suggest a phishing attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/123?utm_term=acrylic+sheets+canada PDF link annotation
    • http://nnorm-id.com/lia_informant_app8xtkv.pdfIn PDF document text
    • http://soinjaga.ru/ejemplos_de_estudios_de_casos_en_educacion_especialal2ux.pdfIn PDF document text
    • http://idealica-official.website/63555657840bdies.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454971/normal_60150d3140222.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367296/normal_5fce3fa3f1790.pdfIn PDF document text
    • http://vir-tus.com/tinusewivizipejivawefixj5t.pdfIn PDF document text
    • http://limaxinsto.xyz/55826125629h6qp3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/30a70fc5-b76c-4d68-9750-37696761ffec/dark_souls_3_boss_order_reddit.pdfIn PDF document text
    • http://bevasisomari.epizy.com/prayer_attahiyat_in_tamil.pdfIn PDF document text
    • http://tijetefewojo.epizy.com/5212791391.pdfIn PDF document text
    • http://nuliduwaxud.rf.gd/96971992800.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38e95410-0c38-4a24-a554-1adc3db8805b/death_notices_columbus_ohio.pdfIn PDF document text
    • http://desiwafinu.epizy.com/tisuku.pdfIn PDF document text
    • http://jekidosokun.epizy.com/zokuvo.pdfIn PDF document text
    • http://luxizetugo.epizy.com/ccleaner_softonic_free.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_off0000e494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE494 4796 bytes
SHA-256: a62180d2849a73fad3a30cd7f15348f02647d0411f91049e47cc36b2303f7b31
font_01_sfnt_off0000f4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CB 12576 bytes
SHA-256: aa7886d049e9c449f47c49ea5366d38c3f50f4608a209edf3deb97f50d5e8c22
font_02_sfnt_off00011e58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E58 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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