Malicious PDF — malware analysis report

Static analysis result for SHA-256 c34b88026a0b7242…

MALICIOUS

PDF

76.2 KB Created: 2021-03-19 22:38:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: df8738f11fc2f8457f51a7e0ea9d9f25 SHA-1: 5b70116cda9e79b20f2c7527d8f614d91d116333 SHA-256: c34b88026a0b7242d56dd287593629dc88654beebdfaf3fd2d512e489c5bd334
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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/wix?keyword=cualitativo+y+cuantitativo+definicion PDF link annotation
    • http://dozixolabizije.iblogger.org/40014322276.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393511/normal_60547c8353144.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452389/normal_5fd64011ec1fe.pdfIn PDF document text
    • http://winoorama.space/cloud_computing_concepts_technology__architecture_freek2kkh.pdfIn PDF document text
    • http://dkblogin-de.com/goxaneriz3tf.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/e5540b6d-40f7-445a-ab73-9045b72bdb61/ponisukeraripiwiwipe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73ce7f30-437e-456d-813f-18f89ade3366/gobiz.pdfIn PDF document text
    • https://s3.amazonaws.com/xozeb/latelemamapebefatopivi.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/if_clause_android_studio.pdfIn PDF document text
    • http://wubavon.epizy.com/masoviwuwiwevod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53e30dda-8271-424a-814b-c91592ead656/medepinizovamo.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/management_reporter_budget_not_appearing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/490bf1f8-905f-4a6b-956d-a4f263e012bc/fodinuvusorugigufizelafif.pdfIn PDF document text
    • https://s3.amazonaws.com/juwofuxufijup/lista_completa_caracteres_chinos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec7c23ae-c525-4ce4-9745-c5bb9b802202/najekazanek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a96040c-be1a-4ca6-b61c-c09b5cc19fd4/gesofavoki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/134587b0-dd46-4fde-b787-ddd49584c5d8/91157628048.pdfIn PDF document text
    • http://vokulokunupada.epizy.com/bully_anniversary_edition_apk_aptoide.pdfIn PDF document text
    • https://s3.amazonaws.com/lowuwofuxali/96508553397.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_off0000e95f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95F 4808 bytes
SHA-256: 32cb753cbf79f7e319873fc00e249620e6cdfd60cd8559b447ec5b552e45c2f9
font_01_sfnt_off0000f9df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DF 12304 bytes
SHA-256: 83aae964f7beeee38a98a397cd215a13f293c1f6be2143173f3bd07cfcc61f69

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