Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c9ee950bcbbaf9f…

MALICIOUS

PDF

78.4 KB Created: 2021-03-08 17:45:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 529a3a46a725d8bb6ba667bceb85203d SHA-1: 6ec5a1df57b1756bef0d3956e244f776c85ce444 SHA-256: 1c9ee950bcbbaf9fb20f4aa0acc9c4f42f3df2074c174384ea2cb29e839babe9
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. The document body, though heavily obfuscated, suggests a lure related to 'basic english grammar rules' which redirects to a URL on 'soxebez.ru'. This indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://soxebez.ru/strik?utm_term=what+are+basic+english+grammar+rules PDF link annotation
    • https://cdn.sqhk.co/mulepava/bjejh2Y/83358242136.pdfIn PDF document text
    • http://xijulefabogi.getenjoyment.net/optiplex_780_video_card_driver.pdfIn PDF document text
    • http://delinapod.mypressonline.com/introduction_to_machine_learning_python_book.pdfIn PDF document text
    • http://zopokujejisolan.getenjoyment.net/metode_argentometri.pdfIn PDF document text
    • https://cdn.sqhk.co/gebitasixa/qiaib1B/dudij.pdfIn PDF document text
    • https://xizuxikeg.weebly.com/uploads/1/3/0/7/130740292/5766751.pdfIn PDF document text
    • https://nironaguvotu.weebly.com/uploads/1/3/4/5/134530025/3626592.pdfIn PDF document text
    • https://cdn.sqhk.co/kisesawaropo/hggjbA5/reperapizijulojigasa.pdfIn PDF document text
    • https://rigefenasoje.weebly.com/uploads/1/3/0/7/130776330/3272164.pdfIn PDF document text
    • https://cdn.sqhk.co/kamugututu/iggjfla/dekozawupiwoju.pdfIn PDF document text
    • https://kixodebu.weebly.com/uploads/1/3/2/6/132682063/8731550.pdfIn PDF document text
    • https://litizabege.weebly.com/uploads/1/3/4/7/134713043/netawofa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387712/normal_6016f2ed72dbd.pdfIn PDF document text
    • https://xetudutadoboja.weebly.com/uploads/1/3/4/3/134344850/7f8bffd863b.pdfIn PDF document text
    • http://sopesukenapad.scienceontheweb.net/20110923814.pdfIn PDF document text
    • https://cdn.sqhk.co/pirasemofoge/eniahdN/puriwuv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485161/normal_5fde3a352315a.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/bcab9bd0-89d8-4484-b6f3-fca647ee1854/jozukemone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9e9ee4a-9007-4b88-9f0e-b436d7151f89/ghost_riders_in_the_sky_outlaws_tab.pdfIn PDF document text
    • http://kuzemepusiloj.onlinewebshop.net/27682079210.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adddaf07-eec0-4bb3-925e-66ad0c3fcc4b/tezefap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6990da83-d35f-4a1d-9087-bc1bb3f2f2d3/tajuzuxawufelero.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_off0000f718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF718 5364 bytes
SHA-256: 0eb5e63d7332fdc3d6328f5f4670cbe83b1ceba025dedcda8dc32e1c57faa1ef
font_01_sfnt_off0001093b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093B 10412 bytes
SHA-256: 0bbe6070936448d9740f4d559028d322c81475835dfe4770beafe0d5ab3df690

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