Malicious PDF — malware analysis report

Static analysis result for SHA-256 31529076cfd0769e…

MALICIOUS

PDF

79.8 KB Created: 2021-04-25 17:22:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 1096c93a568cefada4b3226824974483 SHA-1: b2826338e22e20d12322df6803804aa83c27ac59 SHA-256: 31529076cfd0769eccd5ac8e1b41bd8214132a463cbaa9e518b3799f1d7c0145
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 0.9998

Heuristics 6

  • 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.
  • 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://jumiwimov.ru/strik?utm_term=how+to+survive+college+with+adhd PDF link annotation
    • http://fujepopini.22web.org/caballo_de_troya_1.pdfIn PDF document text
    • http://deladinabixek.sportsontheweb.net/anlise_multivariada_de_dados_6_ed.pdfIn PDF document text
    • http://buputenajonix.mywebcommunity.org/80284862730.pdfIn PDF document text
    • http://xuxadozikekop.iblogger.org/gelonofibig.pdfIn PDF document text
    • https://lomofatawepap.weebly.com/uploads/1/3/4/5/134599642/saget_getaposenisijub_zesoriliputuf_wiwemelosolefeg.pdfIn PDF document text
    • https://doxazijizule.weebly.com/uploads/1/3/4/6/134640144/bbda6318020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/62a45b79-b5c6-4113-9ae1-906de96e115a/95165716841.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1500e4e6-9538-4b4c-8cc1-e8eb29d79af3/which_three_branches_of_government_is_the_most_powerful.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47d15d76-1fc0-455c-a519-3577f16fa944/best_fake_tan_for_sensitive_skin_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52bdd1dd-f524-4399-9ddd-8171f1e4504f/foxaxukokizobonuru.pdfIn PDF document text
    • http://wovuluvoju.onlinewebshop.net/95139519995.pdfIn PDF document text
    • http://lopakesuzuw.atwebpages.com/32410060457.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ce89e18-b05d-487e-8be8-82fbadab7cd8/72975637530.pdfIn PDF document text
    • http://tivapatovike.epizy.com/nibotemudim.pdfIn PDF document text
    • http://gomugugagaf.onlinewebshop.net/arbitrary_waveform_generator_block_diagram.pdfIn PDF document text
    • http://fogovulosuzan.onlinewebshop.net/best_self_tanner_for_very_dry_skin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b2033ec-b6c1-4131-9362-074733e9f4e0/what_was_the_architecture_of_ancient_greece.pdfIn PDF document text
    • http://telifujovemevo.atwebpages.com/pdf_absalom_absalom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01e2e081-e348-4705-b891-66783224e4ad/49989797269.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d935080-396f-4a77-9977-588384a4ed16/butotowupetuzoxixus.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_off0000fa3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3B 5316 bytes
SHA-256: 21278166a616460923e5c67c7d09223f83189cd624aeb70b642a3896164d21b1
font_01_sfnt_off00010c59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C59 11048 bytes
SHA-256: 08321da67cf75224767795d13d4bb145b47a3489e878f403b5dce8ec2fb06a7d