Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf9cd25e078f005c…

MALICIOUS

PDF

73.9 KB Created: 2021-02-19 13:45:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: e860fe3abed322e799dc89c06732b750 SHA-1: 1ff509a7ee09b4fa513e806982bbd4b31eaa2d16 SHA-256: bf9cd25e078f005cb67e798536d82f7bb3bb22e0db4561b30fd778983780fc01
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, specifically targeting users searching for 'the walking dead mod apk obb'. The document body, though heavily obfuscated, contains references to wkhtmltopdf and the creation date, suggesting it was generated programmatically. The presence of multiple disposable hosting domains and link farms indicates a phishing or malware distribution campaign.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=the+walking+dead+mod+apk+obb In PDF document text
    • https://gaburidukir.weebly.com/uploads/1/3/4/4/134463400/589ba647b77555.pdfIn PDF document text
    • http://sefesojobibif.iblogger.org/dorebo.pdfIn PDF document text
    • http://alisabor.design/54670567161s6p18.pdfIn PDF document text
    • http://reduslimitalia.website/xatifimemapzj4.pdfIn PDF document text
    • http://kokoponabile.iblogger.org/zekonatupunolopobivuwi.pdfIn PDF document text
    • https://zadivodewereb.weebly.com/uploads/1/3/2/6/132683121/xitobivuzubadu_netavumawogewop.pdfIn PDF document text
    • https://jewelilug.weebly.com/uploads/1/3/4/3/134331877/sevule_sovemuzixojara_jefugubu_kelofe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453730/normal_601d7acf13631.pdfIn PDF document text
    • https://zasuzepomuban.weebly.com/uploads/1/3/4/6/134627511/vawufimijesup-mitibukeluvosuv-sikiponuzokij-giromexaretegog.pdfIn PDF document text
    • http://fusobilel.iblogger.org/84794347222.pdfIn PDF document text
    • http://simultaneously.space/60126167928jp2cx.pdfIn PDF document text
    • https://wopuxikejixup.weebly.com/uploads/1/3/1/8/131856699/9096ffe611301.pdfIn PDF document text
    • http://gelivebun.22web.org/56491604212.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473916/normal_602b4ff96c602.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
    • http://jipinasin.epizy.com/23592130470.pdfIn PDF document text
    • http://xijukogejutaril.epizy.com/chevrolet_equinox_2016_owners_manual.pdfIn PDF document text
    • http://mekamaxabojumoz.epizy.com/lipupa.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_off0000d830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD830 5052 bytes
SHA-256: 429d5b199249cfa849b613806934255c9d75e7d2d2b82e1f45afa40d46b2ca81
font_01_sfnt_off0000e930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE930 10292 bytes
SHA-256: fd00baad512f5d0d0d073054ea201f7312d5b3f4e8936a1d10e67f19e3029995
font_02_sfnt_off00010c74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C74 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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