Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fc274ecdbea27a8…

MALICIOUS

PDF

81.7 KB Created: 2021-05-20 02:31:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c5dbead3ce8f244a623e992a483d8853 SHA-1: 99bc5784a0def6db4476c7b24f5e322934ed84bd SHA-256: 3fc274ecdbea27a8e6638bf691bf66693dc254c205c000574bcf26d64b689d60
156 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 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 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.
  • 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://xajibur.ru/strik?utm_term=curso+desenvolvimento+web+pdf PDF link annotation
    • https://mibimosa.weebly.com/uploads/1/3/5/9/135959727/ed4c0fdb2a196e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501501/normal_5fd95f17e2b33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453144/normal_5fd9e68d87cdb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500453/normal_605c9a07237c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374002/normal_5fd1e25b41cef.pdfIn PDF document text
    • https://nerapusu.weebly.com/uploads/1/3/1/4/131438180/jajaru-wivabesok-bisokonijife-tosasigen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392651/normal_60161a2e266f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501963/normal_6056fd902768f.pdfIn PDF document text
    • https://nibuzexo.weebly.com/uploads/1/3/4/7/134720699/7328797.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470687/normal_6069123ebc84f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/begijufadi/bendy_in_nightmare_run_apkhere.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebbd6586-bcdb-4154-ae6b-ade23c3b78f2/90985381430.pdfIn PDF document text
    • https://s3.amazonaws.com/diwitapezu/mfj-969_deluxe_versa_tuner_ii_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/322bdde0-a0e1-45ab-9f8b-84f35a5c00bb/27359510483.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc6af6dd-dd63-40d3-b26a-543c64e7d311/duchess_of_malfi_act_2_scene_5_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/410f07e5-6696-41d9-96f5-f17d026972de/how_to_pay_traffic_tickets_online_in_texas.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/after_effects_expressions_marcus_geduld.pdfIn PDF document text
    • https://s3.amazonaws.com/poguvelefa/zutufuwa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9eadefa-398d-47c4-9bf2-525cbf0810aa/royal_caribbean_drink_package_time_limit.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e51a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51A 7904 bytes
SHA-256: bc4eb6a142d1242384125b05400c05231cfeb408779a05a58d091be6538875d5
font_01_sfnt_off0000ffb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB5 5172 bytes
SHA-256: f7f41fe4a1bf6b8c8765467bfbd7ddf259b0f3fcc7f0f5b84cb515adcb446cdc
font_02_sfnt_off00011143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11143 12416 bytes
SHA-256: 49583360338e2e84891b083ee01a1b99078bd535dcc668b9cd4d08c53b57e725

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