Malicious PDF — malware analysis report

Static analysis result for SHA-256 81e4fd7b0345b24b…

MALICIOUS

PDF

88.3 KB Created: 2021-05-13 10:30:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4be61b750c0c9c8260b51bced05ac98b SHA-1: 319316076bb56346f898133220025a1bae60b3ea SHA-256: 81e4fd7b0345b24b21dea89ca8b9fcdbaeddbce7fe7428d06bfaa5fbe7411a7d
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 0.9998

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://golowaki.ru/strik?utm_term=libro+aprendizajes+clave+educacion+fisica+primaria PDF link annotation
    • http://sokegex.mywebcommunity.org/cheesecake_factory_happy_hour_menu.pdfIn PDF document text
    • http://fuwiduwoxobol.mygamesonline.org/bio_poem_template_middle_school.pdfIn PDF document text
    • http://palikexifumalam.mywebcommunity.org/lagawabi.pdfIn PDF document text
    • http://fuwiduwoxobol.mygamesonline.org/bazipedakuvopijilo.pdfIn PDF document text
    • http://feremujidonigu.getenjoyment.net/bekoduxaselexedegojiju.pdfIn PDF document text
    • http://pasikufopubiwo.mypressonline.com/el_almohadon_de_plumas_horacio_quiroga.pdfIn PDF document text
    • http://fufirewavit.getenjoyment.net/23323061381.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://56c41596-c8b3-4aa7-a075-23c9724d7f97.filesusr.com/ugd/ed77b2_21bb2fb0282b4f40956f4f853c350479.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4d476c9-4383-4a79-8a9f-c2441974ea79/59814292645.pdfIn PDF document text
    • https://2e5cbe44-7de3-4e3f-b94c-8a8567814465.filesusr.com/ugd/f96b02_08ddd1fe05264b1ab00ccdcd8bb6085b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f527700b-f225-4d4d-a8bc-ccb1d65f0499/dagixenakirurelagipop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f77dfd1a-bc04-47c4-92cb-4ae057ae6580/56252898644.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e347aa8-b272-4f9d-8352-d359c68e9ddb/sat_practice_test_10_writing_and_language.pdfIn PDF document text
    • https://8533cbf3-c0d6-400c-bdf8-8ca38cf0242b.filesusr.com/ugd/135178_d86ce7b93a9d47dda5cdf54d77d03dab.pdf?index=trueIn PDF document text
    • https://82a15d5c-09b3-4b2c-b6d5-cdf01964cb25.filesusr.com/ugd/5adcb9_591d2175a66a46bbad0a1f35d0382bf0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a918c50a-f2ec-448a-a0ca-e9ad643a7268/59491625129.pdfIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/teoria_de_aprendizagem_cognitiva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2b19a66-523d-41f1-888f-45a9df6ebb59/similar_triangles_worksheet_class_10_cbse.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatofubote/paxewixepabop.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_off0001134d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134D 5568 bytes
SHA-256: a7463025a554de53b43cb97dff58d0436a5d28afcf99d9dd42723dad0edf615f
font_01_sfnt_off00012643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12643 14076 bytes
SHA-256: 920ffa925d2d896a9e2b5b240528dcb39a2f6318b4ad95abc73c3986c35b8273

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