Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b972d4b4313d9fb…

MALICIOUS

PDF

79.2 KB Created: 2021-04-09 22:12:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: dff633fcbdc500e6f8f55b7ee70adae3 SHA-1: b3bcdcb3f96bea7bfead17195f6b6bb6f993634c SHA-256: 3b972d4b4313d9fba2a00806d6a24d8a876493464e26192904ec80c42b51b3ce
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-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://dugedepap.ru/strik?utm_term=kangertech+evod+instruction+manual PDF link annotation
    • http://2220202.ru/betty_edwards_drawing_on_the_right_side_of_the_brain_workbook6h1c1.pdfIn PDF document text
    • http://pay-order.info/74394759933fox8b.pdfIn PDF document text
    • http://pilinopumewaza.mywebcommunity.org/darth_plagueis.pdfIn PDF document text
    • http://rokuboxajiga.medianewsonline.com/8981863002.pdfIn PDF document text
    • http://tejasatobes.medianewsonline.com/mifijexif.pdfIn PDF document text
    • http://gerajite.iblogger.org/vavinul.pdfIn PDF document text
    • http://getyourscore.info/is_the_acura_mdx_a_reliable_carta92g.pdfIn PDF document text
    • http://gujifofaxewoman.22web.org/android_google_sign_in_example.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://lonesopuw.onlinewebshop.net/zoom_banyai.pdfIn PDF document text
    • https://393102e6-89af-4738-8cad-89662dba8dc5.filesusr.com/ugd/33a16d_9129861f4ff64014b77457c7b6311767.pdf?index=trueIn PDF document text
    • https://d427386d-3434-45d9-8802-370857a594f4.filesusr.com/ugd/accd1f_d8daa989cb434396a8e0a5265f858a96.pdf?index=trueIn PDF document text
    • http://nanejidemimoke.epizy.com/13860421413.pdfIn PDF document text
    • https://df867d32-629d-4b48-af14-2fc5df20f827.filesusr.com/ugd/287761_4adc8bdf96824fc0a8fa6a9c8bc2a4c3.pdf?index=trueIn PDF document text
    • https://1c684d3d-b1aa-4d58-8f8e-408f9cf37fac.filesusr.com/ugd/64d889_2fdbb2099068464fb66cbc3c6587cd5c.pdf?index=trueIn PDF document text
    • http://nepabisi.rf.gd/nebusebawo.pdfIn PDF document text
    • http://ronodinagidos.rf.gd/ftd_cisco_configuration_guide.pdfIn PDF document text
    • https://a62e46b8-d933-4087-892c-e5439cec6991.filesusr.com/ugd/e9cba9_901a2b599043431dbf074d7a1a5188e6.pdf?index=trueIn PDF document text
    • https://5053e88e-9e18-4719-890c-32a1cca0295d.filesusr.com/ugd/411503_3fe1967f7eb9422697b65ee93ac96057.pdf?index=trueIn PDF document text
    • http://bidejepeko.onlinewebshop.net/chinese_english_dictionary_free_download.pdfIn PDF document text
    • https://e216d865-ddc7-438b-99b2-64609380b1bb.filesusr.com/ugd/7ae8b3_4db1eb3f05684e24935bfbd6f6b68759.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_off0000e9b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B6 5264 bytes
SHA-256: 57b14057e4f79e9563daded1b856f093388148c4acc227c18a626a67d93edb9c
font_01_sfnt_off0000fb72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB72 11052 bytes
SHA-256: 06730088e2998a010b3d97aaedb454575308b40e957fd75da3a4d0d5b1423dd4
font_02_sfnt_off00012153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12153 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3