Malicious PDF — malware analysis report

Static analysis result for SHA-256 09a48c8d664b290d…

MALICIOUS

PDF

95.0 KB Created: 2021-04-22 05:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: c2d30a3c403152579b0bfd12d0a5207b SHA-1: c8244b698a94dc76525ab35b9a51f9c334136fdd SHA-256: 09a48c8d664b290d0e362f98ecf7d4f4815be781a1f4663f48ef8e51b61d2eb7
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, suggesting a link farm or spam campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/strik?utm_term=how+to+speak+korean+basic+words PDF link annotation
    • http://deteluwo.iblogger.org/pdf_prince2_agile.pdfIn PDF document text
    • http://ottics.ru/oprah_winfrey_what_i_know_for_sure_epubjxpau.pdfIn PDF document text
    • http://pabulaluxe.iblogger.org/fawixu.pdfIn PDF document text
    • http://world-wildshop.com/how_to_turn_off_flashlight_on_samsung_phonet54hg.pdfIn PDF document text
    • http://wusejopajaxus.22web.org/gufonoliw.pdfIn PDF document text
    • http://okrasote.info/radio_thermostat_ct30_wifi_module9acz3.pdfIn PDF document text
    • http://sifasawiseziwi.iblogger.org/anamnesis_concepto.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0dc5016f-38c0-4e11-84f4-4717e3ef4ec7.filesusr.com/ugd/4fd84c_45d37041928942ae91bc9081bb498f0c.pdf?index=trueIn PDF document text
    • https://a8a2d6b8-6248-42a0-90a4-e25e421c2e59.filesusr.com/ugd/f63f29_01cc49c78b754a18959d13aec5b5038e.pdf?index=trueIn PDF document text
    • https://144c9d4d-401b-437b-b89f-6a5816d7da47.filesusr.com/ugd/cd33f5_a5da0b89bdb7480e990e620d80701801.pdf?index=trueIn PDF document text
    • http://xunawikavamenu.epizy.com/93219951420.pdfIn PDF document text
    • https://1cdd1dcb-54a5-4750-95ad-c4cce9a68cd1.filesusr.com/ugd/1e32c2_3a25b833f02c488781f8e852490e86ed.pdf?index=trueIn PDF document text
    • https://cef8af8d-7071-4339-ac50-fc417d371010.filesusr.com/ugd/a89196_b0092e130fcd4b7e89d5f093e720e0c6.pdf?index=trueIn PDF document text
    • http://fezovinu.epizy.com/59832875169.pdfIn PDF document text
    • http://wetowotupime.rf.gd/full_size_flannel_sheets_on_sale.pdfIn PDF document text
    • http://sibiziditex.epizy.com/59996217860.pdfIn PDF document text
    • http://warurodezum.epizy.com/21690795856.pdfIn PDF document text
    • http://wasumulavubusol.epizy.com/dental_management_of_thyroid_disorders.pdfIn PDF document text
    • https://3ced707c-20bd-49bb-93f1-edb15be4e391.filesusr.com/ugd/e90305_6d89db2b1df340fab9f0931d28cadfb5.pdf?index=trueIn PDF document text
    • http://diginerovitigu.rf.gd/42169182726.pdfIn PDF document text
    • https://30de3caf-c510-4ce9-8691-b8280dc60d9b.filesusr.com/ugd/4980ee_f44a0f03d6b74164a4c6c93a4558046b.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CD 22596 bytes
SHA-256: 08349701eaced5986efcefe25f06902facad9c782e0d02b6bfd6f4c084e23a59
font_01_sfnt_off00013625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13625 5292 bytes
SHA-256: 42039076d4284d8aeaf2a2c40c3e0e403b9b3d6e4dc351fa7567f9080aa50884
font_02_sfnt_off0001483b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1483B 10812 bytes
SHA-256: 8cf1c8c13483cb622c95dc850411d99bf76a2cc04f05d74710c5974dd502a649