Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d94ca33495293b0…

MALICIOUS

PDF

77.6 KB Created: 2021-03-23 21:50:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1cd36b1dc1b3ad68f6eeb91e93a7118d SHA-1: 1106ffb539ff9f134396a0d6437a510d21f1ad05 SHA-256: 2d94ca33495293b0a885bc2936e050c9a89a54d25a683fa359528021b5755fa1
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 0.9993

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://midufefew.ru/strik?utm_term=we+like+to+play+video+games+in+spanish PDF link annotation
    • http://help-violation.com/bittersweet_symphony_songwfn2l.pdfIn PDF document text
    • https://femutawinitogim.weebly.com/uploads/1/3/5/4/135401040/makoliximirija.pdfIn PDF document text
    • http://gtomishebs.xyz/what_does_the_name_quran_meaningni2p5.pdfIn PDF document text
    • https://gobodozi.weebly.com/uploads/1/3/1/3/131398455/6293816.pdfIn PDF document text
    • http://my-favshopd.online/git_rebase_command_explainedqiibs.pdfIn PDF document text
    • https://gubizelejipeter.weebly.com/uploads/1/3/4/1/134131403/fd758f8b0428143.pdfIn PDF document text
    • http://monoga.space/sisekigj7u9j.pdfIn PDF document text
    • http://itawomen.fun/grundig_s350_manualbcafr.pdfIn PDF document text
    • https://lawuzifelive.weebly.com/uploads/1/3/4/0/134041442/81da12820c4c2d8.pdfIn PDF document text
    • https://vugiwaxe.weebly.com/uploads/1/3/4/7/134739196/sowofagemijelo.pdfIn PDF document text
    • http://gratoramaa.space/65863561616v2733.pdfIn PDF document text
    • http://idealslimitaly-ufficiale.site/didobogazorafusedoparan5ty.pdfIn PDF document text
    • http://dresdenpharma.ru/amazon_gutschein_online_kaufen_rossmanna27xw.pdfIn PDF document text
    • http://top-agent.ru/69921565859oj6o7.pdfIn PDF document text
    • http://cheatyou.site/alcohol_distillation_process_videom8qai.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://332892e0-6a2b-40ad-946e-e7c92c61c867.filesusr.com/ugd/3e5d97_b6fb7e139aa04c7685b799a2168ac69a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/57322848-7d23-4046-a9de-433647428d7f/71675416812.pdfIn PDF document text
    • https://c18d9829-3add-4afa-bc87-35007fe3998a.filesusr.com/ugd/70c1ec_b88d7a3880b6405aac34b722213808c1.pdf?index=trueIn PDF document text
    • https://56f9ebfc-1b58-4ccd-90b9-24793863e956.filesusr.com/ugd/0f3536_7d8fb1ecf7f3467096d3dfeab866abfc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e4910af-420a-4186-a3da-0d54a0aaeb04/gesumolivipijapusu.pdfIn PDF document text
    • https://f4dd034e-00c7-465c-b850-fb2d75accad5.filesusr.com/ugd/769f78_4a4be02c9cac4dd3bfc3bc9e6ca65fb8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/68d3265b-c94a-43cb-a0ac-17bc5b81c90f/do_vibration_machines_help_with_weight_loss.pdfIn PDF document text
    • https://4e4608fd-868e-43f5-b6ba-14e5e4b50785.filesusr.com/ugd/b1f235_665332e5ba1f4d62b334dec75947bfa8.pdf?index=trueIn 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_off0000ef3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3F 5516 bytes
SHA-256: b28c89fd3b2e8eecc0abdba99b191db75cafe65e38b41780d2d6b80bbccd6f7a
font_01_sfnt_off000101f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F3 10820 bytes
SHA-256: 5d1827749d2934fc3f7b0b72035fbc378e56d304c1b190f03885fbc3270a437b