Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ce961aba957eaae…

MALICIOUS

PDF

75.1 KB Created: 2021-04-02 03:03:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e154e0d1165b0ef0b6c2ba53f332fd7a SHA-1: 7444c34093c6d5675b9f778889db790dd72b2501 SHA-256: 3ce961aba957eaaeceeda24d120c711532c848d7ad97ded16bd66773372ac92c
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 0.9991

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://golowaki.ru/wix?keyword=triangle+similarity+worksheet+with+answers PDF link annotation
    • http://pukebebizadolu.mypressonline.com/bivejilexetodakozali.pdfIn PDF document text
    • http://nutetuxiv.mygamesonline.org/how_to_deliver_a_good_speech_in_public.pdfIn PDF document text
    • https://torusakewojowep.weebly.com/uploads/1/3/0/8/130814967/2492714.pdfIn PDF document text
    • https://mipedurekarano.weebly.com/uploads/1/3/5/3/135321071/fe193afaea1.pdfIn PDF document text
    • https://gazesomudari.weebly.com/uploads/1/3/1/0/131070071/vuvikavaragusaleleto.pdfIn PDF document text
    • https://dokegofixak.weebly.com/uploads/1/3/0/8/130873830/2052932.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446400/normal_604a2db837c82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391920/normal_601330d7c2ef9.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/tunenijexe/energy_profile_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24d41790-7396-4964-b27a-130d547af6b1/how_to_clean_sunbeam_cool_mist_humidifier_filter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6c3b2e8-e440-4365-bc70-29dcb59983a4/finudemu.pdfIn PDF document text
    • https://s3.amazonaws.com/voxulija/arihant_iti_engineering_drawing_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9b2ef8e-9c1c-43e1-b982-a7ac6f0fa4ac/how_to_write_a_250_word_scholarship_essay.pdfIn PDF document text
    • https://a694a867-b0fa-45cd-b082-7f9abf80b1a7.filesusr.com/ugd/430cb2_13cf9e64fc244f1193237b74dc0ea191.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/19ee830e-e04a-4f35-ba35-d39d5f08dc26/roluxajofapepufanuxejef.pdfIn PDF document text
    • http://benamow.myartsonline.com/videwimil.pdfIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/53332700526.pdfIn PDF document text
    • https://s3.amazonaws.com/mivokozibu/65373275858.pdfIn PDF document text
    • http://laxolagodofomug.onlinewebshop.net/american_history_notes.pdfIn PDF document text
    • https://0f7a2101-273c-4f7f-b1fd-079d1ad923c1.filesusr.com/ugd/a7ea6f_ddb0dfbda1e948cd8e3debc1f21520af.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/bigufisexaxolew.pdfIn PDF document text
    • http://larovitivejel.atwebpages.com/adjectif_et_pronom_possessif_exercices.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c995a05-6101-47cb-b450-201bcd3d9640/ravabolifaw.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_off0000e78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78A 5308 bytes
SHA-256: 29f78da66733c4d0e123611b9c701bb983aed618aa622539d8b2b494eb478b99
font_01_sfnt_off0000f980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF980 10784 bytes
SHA-256: 371b07094a9e421e0db86838d37aab2ed73b339692286551d55a0b538c5d051b