Malicious PDF — malware analysis report

Static analysis result for SHA-256 95ca6b95fb3c846c…

MALICIOUS

PDF

78.3 KB Created: 2021-04-10 09:48:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: c3c2915725ca4f2de2704d7b732a28ec SHA-1: 2bf0f908d8c87ac20e3e3a57a8300a97458ff972 SHA-256: 95ca6b95fb3c846cd1b3db30a237e748d220d6caa3e9d8169228dc2bf9d547d6
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, identified as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The primary function appears to be redirecting users to potentially harmful content hosted on external domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://nipisod.ru/strik?utm_term=what+are+good+linking+words PDF link annotation
    • http://xbet1.fun/wenofunabefejiwureo2z1.pdfIn PDF document text
    • http://zatodawu.iblogger.org/5670145094.pdfIn PDF document text
    • http://kanshoper.site/88546579754evjf8.pdfIn PDF document text
    • http://viewcreditscore.info/how_did_the_new_england_colonies_govern_themselvesb71t9.pdfIn PDF document text
    • http://axecheat8.xyz/81452191250vvv1l.pdfIn PDF document text
    • http://ritual-venki.online/267024155165wvur.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ca30e0e0-ecf2-44ab-b6a2-fe26291458be.filesusr.com/ugd/34e21e_b3a2e55dec1e414c99566da1c7580e41.pdf?index=trueIn PDF document text
    • http://vutaxinasiva.epizy.com/90136683969.pdfIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/76822397583.pdfIn PDF document text
    • https://9d1e48ad-bcd7-4831-9b7b-7108443a63b6.filesusr.com/ugd/136d07_9529ce7e233f45a5b8b5a232bd3878bb.pdf?index=trueIn PDF document text
    • https://a39ac558-8fe8-437d-9e10-dc9402d6cb9c.filesusr.com/ugd/1ebe14_e3a08ea111de473e8603bf13578aad44.pdf?index=trueIn PDF document text
    • http://xigufogadenake.epizy.com/4215673789.pdfIn PDF document text
    • http://lajawul.epizy.com/19862598962.pdfIn PDF document text
    • https://59548cc9-d6a6-4b2e-bd73-2bfb7290c7b5.filesusr.com/ugd/3fd21f_e4afbf9fe8f34801a3b27d7bf6b5903f.pdf?index=trueIn PDF document text
    • https://a161ff94-1a6f-4367-b6f8-8e513a5e676d.filesusr.com/ugd/4c7633_5325a3b833d24b8ca3b3ce498abb4944.pdf?index=trueIn PDF document text
    • http://gajovab.epizy.com/61065879691.pdfIn PDF document text
    • https://7afd96e6-4611-46d4-9b98-d111b897c281.filesusr.com/ugd/154221_c8f9486267864534b834fe7bb7e7d853.pdf?index=trueIn PDF document text
    • https://0f926834-650c-4d5a-b53c-ad60ae412ccc.filesusr.com/ugd/6a44d8_a9bf19b974114c158ee8987ff85dc2c6.pdf?index=trueIn PDF document text
    • https://10bc5e17-7652-4c7e-9b43-999b3eb3b021.filesusr.com/ugd/5edc69_cc95dd64f75e4ea2a42c7476ca3db312.pdf?index=trueIn PDF document text
    • http://kudovumajumiw.rf.gd/11226373513.pdfIn PDF document text
    • https://146c8b6c-0b46-450b-8ed0-b45f1e2a4974.filesusr.com/ugd/b58d21_3502e877ef37474fbeb086505212f108.pdf?index=trueIn PDF document text
    • http://fikikozazilut.rf.gd/compressed_cellulose_sponge_sheets.pdfIn PDF document text
    • https://054d5c26-596f-48a3-87a7-0fc79031e5db.filesusr.com/ugd/599026_9b2a23090eee4e78bd451a46e1cd1f02.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fejififimaketo/58430548237.pdfIn PDF document text
    • http://fikexole.rf.gd/82144496520.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_off0000f431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF431 5256 bytes
SHA-256: 659406c5a95ea95525c1259fb1cf3b4757296f7c6efb38803af34a1dda95cebb
font_01_sfnt_off00010622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10622 10812 bytes
SHA-256: 2312d3549b7fc960e0fa35c497750b9d185217ef3b38cacc966179ab6eb515fd