Malicious PDF — malware analysis report

Static analysis result for SHA-256 b768fab3d74e9c27…

MALICIOUS

PDF

127.8 KB Created: 2021-03-16 18:40:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: a99abafd46d755c09aef3651466169b2 SHA-1: 4919c890c5fe984527061f54c4e8a79b4e1b7050 SHA-256: b768fab3d74e9c27fae4a33a68c42639278e1e7ecbc0dbed690f4905822a3130
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs, with a significant number hosted on disposable domains. The heuristic 'PDF_SEO_LINK_FARM' suggests a deliberate attempt to create a large number of links, likely to distribute malicious content or engage in phishing. No scripts were extracted, but the presence of external links points towards a potential download or redirection to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://lozipotod.ru/strik?utm_term=storyboard+app+android PDF link annotation
    • http://viteroludobano.mypressonline.com/anti_deep_freeze_free_download_for_windows_7.pdfIn PDF document text
    • http://lesuxofozadize.mygamesonline.org/computer_science_terms_and_definitions.pdfIn PDF document text
    • https://cdn.sqhk.co/loberutebe/iiaijjU/10730079579.pdfIn PDF document text
    • https://xifanelisiwokof.weebly.com/uploads/1/3/0/8/130874433/wafodujodapu_mugepavenalobek.pdfIn PDF document text
    • http://xejepurefe.scienceontheweb.net/gg_1111_physical_geology_lab_manual_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/zisenusaf/cygjoQj/fejavavoxep.pdfIn PDF document text
    • https://cdn.sqhk.co/butiluluvuk/gd7fieF/engagement_party_invitations_free_templates.pdfIn PDF document text
    • https://cdn.sqhk.co/tefozakozup/id2fhda/check24_strompreise_vergleichen.pdfIn PDF document text
    • http://healthit.space/historia_de_espaa_en_la_edad_media_palenzuelapgjjw.pdfIn PDF document text
    • https://cdn.sqhk.co/vixonafom/ggjgjay/pijufufavinijolarudepubo.pdfIn PDF document text
    • https://cdn.sqhk.co/mizipudi/jbhhUjc/run_sheeda_run_game_download_uptodown.pdfIn PDF document text
    • https://cdn.sqhk.co/ribafesupuro/hhahg6G/pinball_arcade_online.pdfIn PDF document text
    • http://savadaqwe.space/kenmore_elite_washer_dryer_dimensionsdzii1.pdfIn PDF document text
    • https://nofefikow.weebly.com/uploads/1/3/4/5/134510094/750ed5c33b7ee.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xifeloj.onlinewebshop.net/zapimimafepekilizopug.pdfIn PDF document text
    • https://6cb1c90e-07cf-4522-b85d-4edd8abc33c8.filesusr.com/ugd/0c41e7_0d69652c3be94c058bee29cfa18c6e44.pdf?index=trueIn PDF document text
    • http://zonatitusajobo.onlinewebshop.net/miller_spectrum_375_replacement_torch.pdfIn PDF document text
    • https://ec8c99fd-5413-4e38-b6a0-2ccbba71fc6f.filesusr.com/ugd/de02f3_f6d873542aa44361915f5a972a7aee8c.pdf?index=trueIn PDF document text
    • https://d064ede3-316f-4d13-8ec5-014b2136b3bd.filesusr.com/ugd/154db6_8a5620317755414aaae38a8a2c592b58.pdf?index=trueIn PDF document text
    • https://52ed6390-a5c1-4502-9f93-599cf6d98ad1.filesusr.com/ugd/f7fbc8_21a7a776fa1c4bd5a45011c9e15e9206.pdf?index=trueIn PDF document text
    • https://1628ddcf-e301-416d-9649-d9339b85441b.filesusr.com/ugd/0b1079_f79b707c2bc24c7a89f2be563dfde6e3.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_off0001b9f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B9F8 5088 bytes
SHA-256: c7aae5a8f1303ec4827c0ab03cf8148da4e89ebf9cc8f0167fa2e70e08bdc4b9
font_01_sfnt_off0001cb57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CB57 11600 bytes
SHA-256: 4659663c0293535e22aed500fd38338ce75cb8c25a35733391b9026a5cf31c79

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