Malicious PDF — malware analysis report

Static analysis result for SHA-256 88395889252ea9f0…

MALICIOUS

PDF

75.9 KB Created: 2021-04-01 00:59:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 85dc0dc285da12cd53a56b2ce7b79774 SHA-1: 5aa06d730408574404a0c447d7e6ef18f6b04380 SHA-256: 88395889252ea9f0616116fae2ef8c6c3bbba9afcbb44c458754cc26db002aeb
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://mezovuduw.ru/wix?keyword=best+mountain+bike+repair+manual PDF link annotation
    • https://cdn.sqhk.co/navififoro/FjgjfLe/freedom_or_union_freedom.pdfIn PDF document text
    • https://cdn.sqhk.co/vabalogu/dXZTTgh/rollerball_cast_2002.pdfIn PDF document text
    • http://pirunumilusarib.sportsontheweb.net/segodivexiperefuxeviko.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492259/normal_5ffaa601cfc5e.pdfIn PDF document text
    • http://xujaxul.mywebcommunity.org/kovedajefepinafozabe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454299/normal_603b6c76b0d59.pdfIn PDF document text
    • https://cdn.sqhk.co/vifamepupib/9UQwZWB/liwumerizelafagemevuno.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427519/normal_6039366b098f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489032/normal_604049ce0b3bb.pdfIn PDF document text
    • https://cdn.sqhk.co/feketukadoz/ifyNiiA/starmaker-_sing_karaoke_songs_itunes.pdfIn PDF document text
    • http://gazedalepi.sportsontheweb.net/riwafokex.pdfIn PDF document text
    • http://perevozka.ru/what_to_put_in_a_time_capsule_for_school1jqcj.pdfIn PDF document text
    • http://mobeditobaxul.scienceontheweb.net/historia_natural_de_la_enfermedad_dengue.pdfIn PDF document text
    • https://cdn.sqhk.co/pirujezexod/VrQifji/62855883380.pdfIn PDF document text
    • https://lonamejekewow.weebly.com/uploads/1/3/5/3/135396766/6e31947c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454982/normal_6058860fd37eb.pdfIn PDF document text
    • http://complerbnp.com/fepafovajidonudezufixubo7mijx.pdfIn PDF document text
    • https://mapunexi.weebly.com/uploads/1/3/3/9/133999872/189a21867a.pdfIn PDF document text
    • http://lnstagramverifiedsbadgesforms.com/tibunanogowulefijimupabaxzmaao.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://naxesabefadufu.atwebpages.com/english_grammar_in_gujarati_angel.pdfIn PDF document text
    • http://tofalit.myartsonline.com/kuzenin.pdfIn PDF document text
    • http://noratev.myartsonline.com/9653889232.pdfIn PDF document text
    • http://kavibajegis.onlinewebshop.net/jabozotalelaxixenomus.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_off0000e9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F7 5220 bytes
SHA-256: 9fc5a545e74a41184dfce9b9dc9ec703da696c6383c3d7cd810825afc6166bf8
font_01_sfnt_off0000fb9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9A 11112 bytes
SHA-256: 178e6c44881b1066dce42f4ed4fa597f0dbf7a76fee6f85dc14b38f8f41b320f

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