Malicious PDF — malware analysis report

Static analysis result for SHA-256 f33b62a4ec2c0ba5…

MALICIOUS

PDF

77.8 KB Created: 2021-03-23 00:54:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8b3c0c4ca101adbedd7198a849610fd9 SHA-1: 5f3792147f2139ffabe26ac27d6deaa72694b4f6 SHA-256: f33b62a4ec2c0ba5b9f326a27a397cac417a21cdc6de3894a5a50a025dcda359
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 0.9997

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://jottigo.ru/123?utm_term=third+grade+math+workbook+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4481278/normal_60047a1a7188e.pdfIn PDF document text
    • https://cdn.sqhk.co/woferomot/dFxTthb/moto_racing_3d_game_java_download.pdfIn PDF document text
    • https://cdn.sqhk.co/xobabowiwa/jihjGnG/52868996498.pdfIn PDF document text
    • https://lutokiwepaje.weebly.com/uploads/1/3/4/2/134266006/ed453ebba75e.pdfIn PDF document text
    • https://jimatekazame.weebly.com/uploads/1/3/4/6/134669874/lelizufab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465274/normal_603b6f45c110a.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefimex/i1jiRhj/vaputozone.pdfIn PDF document text
    • https://tazipapanora.weebly.com/uploads/1/3/0/7/130776418/fegoxilizivaf_wirob.pdfIn PDF document text
    • https://talapilodegopez.weebly.com/uploads/1/3/0/9/130969507/16447ead25d3b.pdfIn PDF document text
    • https://cdn.sqhk.co/lupananonutu/hjSjaBn/maracaibo_weather_reports.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392661/normal_60591e9d29172.pdfIn PDF document text
    • https://dufibivi.weebly.com/uploads/1/3/5/3/135346242/lukivi.pdfIn PDF document text
    • https://sekojeti.weebly.com/uploads/1/3/4/5/134583019/05c59736fc84249.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387232/normal_6022f010e4094.pdfIn PDF document text
    • https://cdn.sqhk.co/difanemifal/mtghja5/sky_events_2020_november.pdfIn PDF document text
    • https://doxekitonibi.weebly.com/uploads/1/3/5/3/135326555/zopesaxolu_jupupi_tiralonabixa_saxal.pdfIn PDF document text
    • https://jewepixixa.weebly.com/uploads/1/3/0/8/130814248/86a0153d6be3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426699/normal_5ffd2676d0f5a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451047/normal_5fd0912898d64.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d9c2aed-278a-48c3-b781-3fa45ca66b65/qu_no_puede_comer_un_diabetico.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0caf3921-f589-49bc-b942-bde43dfb8dcf/95831660268.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_off0000effd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFD 5488 bytes
SHA-256: 43f0cc0de247903da5d6bbc77b178af72a336d0d5ca15204452f935e9726b499
font_01_sfnt_off0001028f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028F 11648 bytes
SHA-256: 5f7f8a382b9e5bca13ccf1dfb13642b4a43b9cae72ff367dd909f85536478a63

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