Malicious PDF — malware analysis report

Static analysis result for SHA-256 403de8beccf8f17a…

MALICIOUS

PDF

70.9 KB Created: 2021-03-10 09:09:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: accf1893f381f97f507ff955a4b2eb1a SHA-1: 563d1ba16d67b0c052ad320e27b15a137cd485bd SHA-256: 403de8beccf8f17ac2f71649ce5f54aa25dd2ddbd97097b65a144ee53a9b13a3
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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://baarspo.ru/123?utm_term=charlie+chaplin+smile+sheet+music+free PDF link annotation
    • https://cdn.sqhk.co/zaweniwefi/f9jaxje/49962104192.pdfIn PDF document text
    • http://zotikarida.medianewsonline.com/ratajotenojol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481155/normal_6021a5b41ef4b.pdfIn PDF document text
    • http://zovofuti.mygamesonline.org/ilive_bluetooth_speaker_system.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485799/normal_5fe9aaec9a56c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414172/normal_5fe6ede64b365.pdfIn PDF document text
    • http://wijutomotagam.mypressonline.com/lumakerinogafixa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393763/normal_601db11c0b725.pdfIn PDF document text
    • https://cdn.sqhk.co/xokipuxat/jijf3ZQ/navodaya_9th_class_application_form_2020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wubexemetaxoru.epizy.com/djpunjab_full_bass_song.pdfIn PDF document text
    • http://danokob.epizy.com/ncert_full_form_in_kannada.pdfIn PDF document text
    • https://36622f5a-5a1b-41a5-aa98-965156e47ac2.filesusr.com/ugd/804ff6_a8e848e7cd50409ab2497884f1bd9f8d.pdf?index=trueIn PDF document text
    • https://abbf68a8-5b21-4996-91be-11266bd273ed.filesusr.com/ugd/9374a7_72b9c8fd04844e05b7f009fc328300d0.pdf?index=trueIn PDF document text
    • https://b354d503-40d1-4c97-84b4-bc0b16c12f35.filesusr.com/ugd/8c7d07_93f8b1958a02485bae2fd6404cc1ebe6.pdf?index=trueIn PDF document text
    • https://48e6b720-b653-4920-beb0-7ef171ab6ab9.filesusr.com/ugd/d9d1f5_e82d79230cac4a2f926536130fdf43fc.pdf?index=trueIn PDF document text
    • http://zafazemebotege.rf.gd/22325771530.pdfIn PDF document text
    • http://pogedezibak.rf.gd/nigarojaxuwaxafame.pdfIn PDF document text
    • http://rovafitazilom.epizy.com/church_service_program_template.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_off0000d583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD583 5160 bytes
SHA-256: 9097b2d2c3125d2150b49ac263fd8b04dd8572bb5c3481c2f7ee96b14e3ce903
font_01_sfnt_off0000e6e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E1 11416 bytes
SHA-256: 705089f42cb9df33cff82dc81db7e37fc2d2a5350ecf2cc81dd5b2198213f5b0

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