Malicious PDF — malware analysis report

Static analysis result for SHA-256 09e3769f7a509884…

MALICIOUS

PDF

79.5 KB Created: 2021-04-23 21:21:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: efb37c7422b484560ecf03c3f791fd95 SHA-1: 7c6e2ed1c2e00d5a68a4e2f9d3d07defc51db106 SHA-256: 09e3769f7a5098844e3c65c27b692463d98f31394ec9d7a8d1ecf4d172644e12
244 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to redirector infrastructure or disposable hosting, indicating a link farm designed to lead users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or a scam. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=character+strengths+and+virtues In PDF document text
    • http://jadogaxarabu.mygamesonline.org/14209763892.pdfIn PDF document text
    • http://ig-support-service.com/57856768403sfd1o.pdfIn PDF document text
    • http://budivev.scienceontheweb.net/5798699878.pdfIn PDF document text
    • http://kmikaerfs.ru/38718308105ttl81.pdfIn PDF document text
    • https://pizovepe.weebly.com/uploads/1/3/5/3/135323062/wavod.pdfIn PDF document text
    • https://pixumoxijabana.weebly.com/uploads/1/3/4/7/134748481/tujom.pdfIn PDF document text
    • https://vukosigubew.weebly.com/uploads/1/3/4/8/134860762/tefawarik_xuzujow.pdfIn PDF document text
    • http://worelimupuvefam.mywebcommunity.org/92901252721.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://734e8db3-b9db-457c-abaa-08c06218e7ae.filesusr.com/ugd/f6bb82_b3f51647f583450792d8e3c1c00587d0.pdf?index=trueIn PDF document text
    • https://c7ecfb45-4de9-4174-91ae-4a3416e09b0d.filesusr.com/ugd/fc4f66_34fff49b299147f18402435cc2372c2b.pdf?index=trueIn PDF document text
    • https://a8a70d16-e3f0-4805-b115-4d8c62c40b57.filesusr.com/ugd/82e28d_1f3dd2c55dc8424abe4d4a67a9db0311.pdf?index=trueIn PDF document text
    • https://a1d1c4ac-cf1d-4c58-861c-45d1188f4b60.filesusr.com/ugd/052f3a_8200407443f14c4b89a5c90e473aa31e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/de7e630b-11c0-44d8-8937-e3a97a0c36da/zomotaremerupemaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1985931-ac55-40c2-ba30-89aff8536e7e/cashflow_quadrant_game_online.pdfIn PDF document text
    • https://s3.amazonaws.com/fotepopunaj/xulujapivotedonenekoxopa.pdfIn PDF document text
    • https://f110cc6a-49d6-427c-9ab6-a3a4d323b004.filesusr.com/ugd/9e53d4_f23950b7da8e4ba481a8c774f97f6e40.pdf?index=trueIn PDF document text
    • http://livirava.atwebpages.com/84224622740.pdfIn PDF document text
    • https://s3.amazonaws.com/petubapizo/10024466272.pdfIn PDF document text
    • http://mawidinivetobi.myartsonline.com/edit_text_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc7fe01a-faec-495a-8feb-6b1520dde484/what_is_the_relationship_between_gdp_and_unemployment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ddc79ee-c7ab-455a-a7be-cbc200702dc7/jikanesazanegeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cb72df1-4b02-4ab4-963d-ba047cca68b1/cuanto_esta_la_entrada_al_circo_de_la_chola_chabuca_2019.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_off0000fb23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB23 5132 bytes
SHA-256: bdecc959cf5d224dfd0a94d8af5f88650cd58bd82f4494c47ec8ac7544b9d7dd
font_01_sfnt_off00010c92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C92 10440 bytes
SHA-256: 241fd006aa1c396c3d6c06faab82952735efb05363bd5ddcdeb3bc22254e9f43

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