Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd5730d5de1cd895…

MALICIOUS

PDF

77.2 KB Created: 2021-03-30 04:47:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 6d7532e5d0c054d3e8bdb6cac44d01f9 SHA-1: c40e556ff37328ac11359052d43b6475d10026a5 SHA-256: bd5730d5de1cd895f4888074b201d647f462ebbbe7b589e8e09f77677da71600
186 Risk Score

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 0.9997

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
  • 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://bologen.ru/award?keyword=printable+august+2020+calendar+pdf PDF link annotation
    • https://simebusuf.weebly.com/uploads/1/3/1/4/131406507/valag.pdfIn PDF document text
    • http://zumufufup.sportsontheweb.net/market_segmentation_strategy.pdfIn PDF document text
    • http://leyloften.online/95830892366tj9j4.pdfIn PDF document text
    • http://pojapir.mygamesonline.org/fourteenth_amendment_to_the_united_states_constitution.pdfIn PDF document text
    • https://xapodopuk.weebly.com/uploads/1/3/1/8/131856257/gorituvoxe-rekaze-jilamisi.pdfIn PDF document text
    • http://googsnat.space/ligedavelifapisebm9gs.pdfIn PDF document text
    • https://danigutido.weebly.com/uploads/1/3/1/1/131163693/8cd42.pdfIn PDF document text
    • https://xikofekukinakij.weebly.com/uploads/1/3/2/6/132681309/6784673.pdfIn PDF document text
    • https://kogekotosejikol.weebly.com/uploads/1/3/5/4/135400664/rufurakepo_kipubitoj.pdfIn PDF document text
    • http://desokore.medianewsonline.com/kufizonizilaruji.pdfIn PDF document text
    • https://nanexore.weebly.com/uploads/1/3/5/3/135351495/japifesajitow_tedeno.pdfIn PDF document text
    • http://itash.space/3rd_grade_multiplication_worksheets_common_core5dfgs.pdfIn PDF document text
    • https://welabelodaset.weebly.com/uploads/1/3/5/3/135399274/2691261.pdfIn PDF document text
    • https://finubakexa.weebly.com/uploads/1/3/1/3/131383318/3271860.pdfIn PDF document text
    • http://padojobimo.mywebcommunity.org/97391772558.pdfIn PDF document text
    • http://vijexibat.mywebcommunity.org/troy_bilt_pony_drive_belt_routing_diagram.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b1706aec-e9b1-4c6c-9a93-f14ef4a1c402.filesusr.com/ugd/3b47cb_6e36f6a4c9454be6a1b7092a11e307e4.pdf?index=trueIn PDF document text
    • https://b32521b7-32ca-447e-9967-d27d0dce683d.filesusr.com/ugd/800b88_f01090d76e06435b858281e8951587f7.pdf?index=trueIn PDF document text
    • https://15319a82-8c66-4906-b3c2-464277991f2b.filesusr.com/ugd/070acf_9cb1c67d4e78413aa5b2e402dfc95e41.pdf?index=trueIn PDF document text
    • http://lojubefogugiku.onlinewebshop.net/14859888.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_off0000f14e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14E 5740 bytes
SHA-256: d36dffbe99baa880cc93c40dcd6b1fff936f9e5e24542445d8dfdc959662f585
font_01_sfnt_off000104df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DF 10280 bytes
SHA-256: 551d04bbca472a14d1010c2b05eb8ae5b536d317127f337549b18402644623a7

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