Malicious PDF — malware analysis report

Static analysis result for SHA-256 817e92062b3ae0ad…

MALICIOUS

PDF

92.2 KB Created: 2021-03-27 21:36:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: e39da2fa9df3514739499f8d237195a0 SHA-1: 539ae395b808d9026cfa5a14fde5568ec7413476 SHA-256: 817e92062b3ae0ad727ce57789cb3b63df1a0c427c18e59fa9c20e1458d5fecc
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 0.9988

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://maypoin.ru/award?keyword=ma+sociology+syllabus+pdf PDF link annotation
    • http://tuzupibu.scienceontheweb.net/30397250554.pdfIn PDF document text
    • https://kesudidudoj.weebly.com/uploads/1/3/4/4/134477594/goxap.pdfIn PDF document text
    • http://finipupote.mywebcommunity.org/85601243370.pdfIn PDF document text
    • http://kobivoweder.mypressonline.com/28377373564.pdfIn PDF document text
    • http://wumiwuzigimo.mywebcommunity.org/20539479257.pdfIn PDF document text
    • https://ronumotesagazuw.weebly.com/uploads/1/3/4/3/134373959/todelivowo-mujofadexo-zidipipirabavax-mitipikifi.pdfIn PDF document text
    • http://lexamopelezun.mywebcommunity.org/24614116384.pdfIn PDF document text
    • http://towonededuv.medianewsonline.com/bulova_marine_star_98b301_review.pdfIn PDF document text
    • https://mowazaxof.weebly.com/uploads/1/3/4/7/134704653/3853285.pdfIn PDF document text
    • https://vogoworelo.weebly.com/uploads/1/3/4/2/134266182/vafudo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://3f9320ff-391d-49df-b192-c557e211a93c.filesusr.com/ugd/469aea_5c7ddd89ed72445d90588e1c4c2fe036.pdf?index=trueIn PDF document text
    • http://zowofiz.myartsonline.com/bruce_schneier_applied_cryptography_2nd_edition.pdfIn PDF document text
    • https://43a2ba88-5de9-465b-b95f-6a4d82f2d06e.filesusr.com/ugd/dcbeda_093f6514df144a258ece3fc5a65c0a6d.pdf?index=trueIn PDF document text
    • http://dasobiviwadodaj.atwebpages.com/61605651611.pdfIn PDF document text
    • http://gufopexolax.myartsonline.com/cupid_and_psyche_apuleius.pdfIn PDF document text
    • http://tisumejokilufon.rf.gd/dont_let_stereotypes_warp_your_judgments_summary.pdfIn PDF document text
    • http://vomemozasaz.rf.gd/80963668292.pdfIn PDF document text
    • https://944bcc21-9f45-42c2-9889-8cf837fa5d1c.filesusr.com/ugd/50f869_5468a1f1f3384af0bb7bcb2a2ddcd3c9.pdf?index=trueIn PDF document text
    • http://tobikinos.onlinewebshop.net/what_is_the_message_of_the_miracle_worker.pdfIn PDF document text
    • http://xelilurezo.epizy.com/bbc_janala_english_learning_book.pdfIn PDF document text
    • http://vagowezu.epizy.com/kikir.pdfIn PDF document text
    • http://likasuretaw.onlinewebshop.net/pirates_of_caribbean_easy_piano_sheet.pdfIn PDF document text
    • https://ce83042b-5faf-46b5-bcbb-9b4d05ec7d33.filesusr.com/ugd/a31856_595c9c169dca4026a6bd5a1309bb1f27.pdf?index=trueIn PDF document text
    • http://bitenozof.atwebpages.com/chromatography_articles.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_off00011f93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F93 5052 bytes
SHA-256: 5c7bf34ea6fd312f3c6f241cfa5f028968a949f6a7b31b900cf7e247ede30fcd
font_01_sfnt_off000130ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130CA 10808 bytes
SHA-256: 53beb38fec9a5ee80eaa9945a4420bcfc7e6b69a26f738755c85b8ee5b91a155
font_02_sfnt_off00015567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15567 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e