Malicious PDF — malware analysis report

Static analysis result for SHA-256 13be1305eab84fbc…

MALICIOUS

PDF

74.9 KB Created: 2021-04-05 02:54:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3a754a782d46ad8d0ec2c13e2a6e932a SHA-1: faa0cd2c422f3c5f0a442c33f94c02a6d6350ba2 SHA-256: 13be1305eab84fbcaa9c8b6a23c573f40a469cc0f350a5368ff13a4f6be06090
156 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 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://druttle.ru/123?utm_term=advanced+systemcare+ultimate+10+pro+free PDF link annotation
    • http://feporerapupanun.iblogger.org/ford_ranger_4.0_l_towing_capacity.pdfIn PDF document text
    • http://dopelozaf.22web.org/bases_de_datos_distribuidas.pdfIn PDF document text
    • http://ruzagasaz.iblogger.org/92215330850.pdfIn PDF document text
    • http://soruboseveli.iblogger.org/jamaica_outline_clip_art_free.pdfIn PDF document text
    • http://nibumuxadata.66ghz.com/ms_sql_test_database.pdfIn PDF document text
    • https://xokiguju.weebly.com/uploads/1/3/4/6/134679394/4f6c4c12b.pdfIn PDF document text
    • https://vujafufitagizej.weebly.com/uploads/1/3/2/6/132696128/karigotupewofaxasuma.pdfIn PDF document text
    • https://ziridizozavixik.weebly.com/uploads/1/3/4/4/134400570/e82fb0.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/fosagobomap/97219736819.pdfIn PDF document text
    • https://s3.amazonaws.com/libusamagowuvo/33147417579.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/avianca_flight_052_ntsb_report.pdfIn PDF document text
    • https://068ba8bc-08b0-4b68-8151-f3c59c7a5775.filesusr.com/ugd/5a4aad_03a2dbc93b794f81baa47efaac5f1f81.pdf?index=trueIn PDF document text
    • https://55963656-6eb1-4b25-bcd5-bb835d65808b.filesusr.com/ugd/0064ae_3641e3c1584f44248fc502d33a03033f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/app_landing_page_template_bootstrap.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/invoice_template_free_google_docs.pdfIn PDF document text
    • http://duxurajixi.rf.gd/50310842575.pdfIn PDF document text
    • https://s3.amazonaws.com/tigovatolis/75046649539.pdfIn PDF document text
    • https://7fd92c66-d3af-485c-b7a9-31529ddfb1b5.filesusr.com/ugd/997d0f_7d8a71f3ddf0414bba86404856d2e537.pdf?index=trueIn PDF document text
    • http://durafewiluros.epizy.com/phonetics_and_phonology_peter_roach.pdfIn PDF document text
    • http://dagajevefud.epizy.com/lufipurexuzaba.pdfIn PDF document text
    • https://s3.amazonaws.com/fixararololu/16562954273.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_off0000e32e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32E 5644 bytes
SHA-256: a4263214051a9395f75c73525c0c43abcafe8abefa1d5569185eb4ced47db902
font_01_sfnt_off0000f65e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65E 11688 bytes
SHA-256: 0b7aef25ae72e0a7a7606f989ae09e38110dd21a68b4185dbfeab1cfe051360f

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