Malicious PDF — malware analysis report

Static analysis result for SHA-256 2338914ce3fcd55a…

MALICIOUS

PDF

78.0 KB Created: 2021-03-07 21:36:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ba88ac2a9a3dfb298179a69e81475263 SHA-1: 6bd94df19bc3bc3fa34494454830964d9a4dd05f SHA-256: 2338914ce3fcd55a080eb0259e3b2660305cd7baba2ed1836a89b4cde7cb8659
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or SEO spam operation. 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 numerous URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jumiwimov.ru/strik?utm_term=samsung+un55f6300af+price PDF link annotation
    • http://komaxinatobofe.medianewsonline.com/52241073525.pdfIn PDF document text
    • https://pefikasulanak.weebly.com/uploads/1/3/4/3/134350375/fd903bd111886.pdfIn PDF document text
    • http://fegivate.medianewsonline.com/25459600928.pdfIn PDF document text
    • http://napowojeba.medianewsonline.com/76485431876.pdfIn PDF document text
    • https://ripafikumitepi.weebly.com/uploads/1/3/4/6/134622323/kilajijekak.pdfIn PDF document text
    • http://tiluvopira.medianewsonline.com/60496981340.pdfIn PDF document text
    • https://gizivesokopupa.weebly.com/uploads/1/3/2/6/132696604/951d5a7cdc5.pdfIn PDF document text
    • https://vobilazi.weebly.com/uploads/1/3/5/3/135300702/zidulepidowivowes.pdfIn PDF document text
    • https://gogesatita.weebly.com/uploads/1/3/4/3/134321397/sigik-vijipegel.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e46eb8ae-11b5-47af-91b5-79e2db369635.filesusr.com/ugd/f84671_05e5696bfce04fe5bfb19c21b7be2abd.pdf?index=trueIn PDF document text
    • https://2ed821ec-8078-4e74-b11b-c5cec6a88262.filesusr.com/ugd/65e777_02915a2ef3a7428aa194b00a6cd46ecb.pdf?index=trueIn PDF document text
    • https://8eccd3b7-fb20-4588-a5b5-4d8c58591879.filesusr.com/ugd/0e6328_9791d0dbc1444f5c952c709ac6549735.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/baxunaf/sizazamez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88dbbb5d-0c09-43ea-9d37-eca3f40442e0/why_are_my_keyboard_lights_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/total_war_rome_2_dlc_guide.pdfIn PDF document text
    • http://kimawawasero.onlinewebshop.net/how_to_clean_a_used_torque_converter.pdfIn PDF document text
    • http://rulamiji.onlinewebshop.net/ramen_cookbook_barnes_and_noble.pdfIn PDF document text
    • http://pikubub.onlinewebshop.net/how_to_cook_rice_in_the_electric_pressure_cooker.pdfIn PDF document text
    • https://c8019651-2137-4367-b38e-775fff3f8a75.filesusr.com/ugd/fc5a02_c3f9892714f0412696c3cd2c6fbe480f.pdf?index=trueIn PDF document text
    • https://d19688e0-347f-4d9d-8cb3-d47c6e049f3d.filesusr.com/ugd/c618e9_31a434338a60465cbbdb262d84d26db0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7392efa8-2b9c-4497-a930-c746342aee1b/kaleroxojaginami.pdfIn PDF document text
    • https://s3.amazonaws.com/timeziso/41167294791.pdfIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/sql_server_2014_utorrent.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_off0000f0a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A0 5992 bytes
SHA-256: a826a160c495a5fb98944df05cb66839f03db5730f11160fe5d28b9e7ba1c936
font_01_sfnt_off000104e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E9 11172 bytes
SHA-256: 77b021fe498f30e45ce52e3acf59ce17e38e738e475bcf8036035c2e11d10ce7